Kelly Osbourne has thanked her "perfect" mother for always being there for her.
The 29-year-old star has written a heartfelt letter to her mother Sharon Osbourne, wishing the former 'X Factor' judge a happy mother's day and thanking her for her continued support, despite admitting she was often ungrateful in the past.
Writing on her official website, she said: "Thank you for all the sacrifices you have made in order for me to have a better life. Thank you for never giving up on me when I blamed you for everything I was doing wrong.
"Thank you for teaching me what love is and guiding me to become the person I am today. I am the person I am today because of you."
The E! 'Fashion Police' critic also apologised for trying to push her mother - who is married to Black Sabbath rocker Ozzy Osbourne - away and confessed she's happy she's grown to be more like her.
She wrote: "You are the beautiful, kind, generous, loving and let's not forget strongest person I have ever met and the best part is that you are MY mum.
"I may not be exactly like you but if there is anyone in this world I am most alike it is you Mumma, and I am so proud to be your daughter."
Kelly did joke, however, that there is one thing her mum didn't teach her, and she's happy about that.
She said: "The only thing you never taught me was how to cook! (I really am grateful that YOU never taught me because I probably would have poisoned someone by now.) (sic)"

Oscar Pistorius has an anxiety disorder, his murder trial heard today (12.05.14).
Forensic psychiatrist Dr. Merryl Vorster described the athlete - who is charged with murdering girlfriend Reeva Steencamp - as a "distrusting and guarded" person who is "hyper-vigilant" about security and often feels "isolated and alone" as she took the stand at the North Gauteng High Court in Pretoria.
However, her evidence caused state prosecutor Gerrie Nel to argue the athlete's mental health should be examined more fully, which could delay the trial for up to a month if he is admitted to a psychiatric hospital for tests.
Pistorius claims he shot his partner after mistaking her for an intruder, and the psychiatrist spoke at length about his "fight or flight response", claiming he is more likely to stand up to threatening situations than to flee because of his disability.
She also said: "When in South Africa he worries about being followed and about the security of his home."
She spoke of how he sleeps with his bedroom door locked and frequent night wakings, believing he hears noises, explaining his increased anxiety levels mean he "perceives his surroundings as being threatening when perhaps they're not".
If the 27-year-old athlete is found to be suffering from a mental illness, he could not be health criminally responsible for his girlfriend's death and would be found not guilty by reason of "mental illness or intellectual disability".
The trial was adjourned before prosecutors could make any formal application for a psychiatric referral.

Harry Styles has "fallen in love" with South America while on tour with One Direction.
The pop star - who has been performing with band mates Niall Horan, Louis Tomlinson, Zayn Malik and Liam Payne - has already had a tattoo of 'Brasil!' tattooed to his groin and has now posted a tribute to South America on his Twitter account today (12.05.14).
He wrote: "South America, you have been absolutely incredible. I have fallen in love with you. Hope to see you again soon. H. (sic)"
The 'You & I' hitmakers performed their last South American show in Sao Paulo, Brazil, last night (11.05.14) and will now enjoy a couple of weeks relaxing before their world stadium tour resumes in Dublin, Ireland later this month, and Niall is excited about performing on home soil.
He also tweeted his thanks after their gig in Brazil, posting on Twitter: "That was incredible Sao Paulo ! Stadium was huge ! Thank you ! Xx (sic)"
The boys have been seen cosying up to Brazilian pop singer Anitta during their trip and were also approached by legendary footballer Pele for a collaboration.
A message posted on the band's offical Instagram account, with a photograph of Harry, Louis and Zayn, also read: "South America - you've been incredible! Next stop is Ireland! #WWATour."

Justin Timberlake's parents encouraged him to put in "115 percent" when working.
The 33-year-old pop star and actor, who rose to fame began his career as part of boy band 'N Sync, before becoming a successful solo star, credits his mother and father for teaching him the importance of hard work.
Speaking to Oprah Winfrey for her Oprah's Master Class series, Justin said: "That was something I remember my parents telling me. The idea that if you put in more than 100 percent, if you put in 115 percent, then there's a good chance that you're going to end up getting back somewhere in the 90's. That made sense to me."
Justin practiced singing and dancing growing up for hours on end and only performed live when he felt ready to face an audience.
He continued: "And the idea that something worth having was worth putting all of yourself into it. Practice, rehearsal, working on it when no one's looking.
"Getting comfortable in it. So that when you step on that stage, you're ready. And then you can literally forget all of that and just be in the moment. And do something different. Do something original, do something different every time."
Meanwhile, Justin appears on Michael Jackson's posthumous album, 'Xscape', which was released last week and revealed it was Michael who made him believe he could go solo.

Josh Hartnett's 'Penny Dreadful' character is "full of mystery".
The 35-year-old actor rose to fame in blockbuster films such as 'Pearl Harbour' and 'Black Hawk Down' but later left Hollywood to pursue grittier roles, and he's now set to star in the new horror series based in 19th Century London.
He said: "I play Ethan Chandler, the only American in the piece, and you don't really know why he's there in the beginning and he's full of mystery, and then after the first couple of episodes you want to ask him why he's sticking around, because so many supernatural things are happening."
The series is named after a form of British fiction from the era, which focused on lurid and sensational subjects, and features a number of characters from classic fiction including Dracula, Dorian Gray and Frankenstein, but Josh claims little is known about Ethan until late in the first season.
Speaking on 'This Morning' earlier today (11.05.14), he said: "What's really nice about this character is you don't really know anything about him, empirically, until further into the first season, which is eight episodes long. So that's eight hours. I've never done anything like this before."
'Penny Dreadful' - which also stars Billie Piper, Eva Green and Timothy Dalton - starts on May 20 at 9pm on Sky Atlantic.

Lindsey Coulson finds it hard to "detach" from her 'EastEnders' character.
The 53-year-old actress plays Carol Jackson - who is currently battling breast cancer - in the BBC One soap and has admitted she finds it hard to disconnect from the role when she's not filming.
Lindsey said: "At first ... at Christmas, when I actually found out the diagnosis and played all of that stuff, I did find it hard to detach.
"In fact, I started a running group. I started running for six weeks. I don't like running, but I needed to know that I actually am healthy and I sort of detached slightly."
Lindsey - who first joined the soap in 1993, but has taken several breaks since - found it difficult to research her current storyline as she wanted to include the stories of all the breast cancer sufferers she spoke to.
She told ITV's 'This Morning' earlier today (12.05.14): "The thing about doing a breast cancer story is, everyone has a story to tell about breast cancer, and at first it was really overwhelming because I wanted to get the story right for so many people, because I sat and talked with so many women.
"I wanted to show the vulnerability and the ugliness of it and I think the script writers have done that."
Despite her character experiencing such emotional turmoil, Lindsey admits she was thrilled to be reunited with Michael French, who returned as her long-term love interest David Wicks last year.
She added: "He makes me work very well, actually. It's like a tennis match with Michael. Without doing anything the history is just kind of telling the story."

Rolf Harris allegedly assaulted a teenage girl while his daughter was in the room, a court has heard.
The former children's TV presenter - who denies 12 counts of assault against the woman and three other girls between 1968 and and 1986 - has been accused of abusing the unidentified female, who was friends with his daughter Bindi, from the age of 13 at his home, as well as hers, and on holiday.
The woman - now 40 - gave evidence from behind a screen at Southwark Crown Court today (12.05.14), claiming Rolf, 84, performed a sex act on her at his home in Bray, Berkshire, and didn't seem troubled by the fact Bindi was asleep nearby.
The claimant also described other instances of abuse by the former 'Animal Hospital' host, alleging he once fondled his penis in front of her. She described the Australian star's anatomy as "small ... very, very small".
Rolf is also accused of inappropriately hugging and tickling the then-teenager and was branded "creepy" in court.
The woman said: "The way he hugged you and tickled you all over was cringey. I never liked it. Rolf would fold himself around you. He was a big man. He would fold you in his arms and tickle you up and down your body."
Quizzed why she never told Rolf's daughter Bindi or his wife Alwen Hughes about the attack, the claimant said: "I was shocked and panicked by it. I didn't know what to do. I sat on the end of the bed in a state of shock, really."
The trial continues.

Rita Ora was careful not to "embarrass anybody" filming 'Fifty Shades of Grey'.
The 23-year-old singer is set to try her hand at acting in the new blockbuster adaptation of E.L. James' best-selling erotic novel and she admits she was so nervous about her role - playing Christian Grey's sister Mia - she worried she would mess up.
Appearing on Capital FM's Vodafone Big Top 40 on Sunday night (11.05.14), she said: "I've just shot the movie, 'Fifty Shades of Grey'. That took up a lot of my time as I didn't wanna embarrass anybody, so I made sure I knew exactly what I was doing.
"It was an incredible experience. I went from not knowing what it's like being on a movie set, to feeling like I knew them all for years, and I wasn't even there for that long."
'Fifty Shades of Grey' will star Irish hunk Jamie Dornan in the role of bondage-loving Christian Grey and newcomer Dakota Johnson as his virginal paramour Anastasia Steele.
Ora admits part of her nervousness stems from joining the film's cast so late into production.
The singer explained: "They'd already been filming for months and months, so I came in mid-way through the film. I can honestly say it's so cool to be in it. I'm so excited, I was really nervous. I kind of came in last minute, I auditioned last minute."
'Fifty Shades of Grey' is out next Valentine's Day (14.02.15).
Catch The Vodafone Big Top 40 every Sunday at 6pm with Capital presenter Marvin Humes .

John Hurt is being lined up to star in 'The Man Who Killed Don Quixote'. The veteran actor has been approached by Monty Python legend Terry Gilliam to star in his long-awaited satirical film, SIC is reporting. 'The Elephant Man' star made the admissi...

Josh Hartnett claims witnessing poverty while making 'Black Hawk Down' made him "rethink" his own life.
The 35-year-old actor pursued roles in blockbusters before making the 2001 action film, which was based on the Battle of Mogadishu in Somalia, and he's confessed that seeing children that had been intentionally injured so they could earn more money as beggars made him question his own path.
Quizzed on whether he'd found it hard to work on 'Black Hawk Down', he said: "Honestly it wasn't that traumatic for me, but being in a place with that amount of poverty, the only real opportunity that people had to make money was to beg.
"So children were being maimed when they were very young to make them better beggars and it just forced to me to rethink what I was doing a little bit."
The 'Penny Dreadful' star left California to return to his hometown where he focused on reconnecting with his family and friends.
Josh told ITV's 'This Morning': "I moved back to Minnesota after doing 'Black Hawk Down', and that was just a few films that I was working on didn't come together in the way that we had hoped they would or in the time we had hoped they would.
"So I went back and wrote a screenplay and I got back together with my high-school girlfriend actually and just spent time with my friends and family back home."

Tom Hanks and his wife exercise together.
The 'Saving Mr. Banks' actor was diagnosed with Type II diabetes last year, and since then, he and spouse Rita Wilson have made health and fitness their priority.
Rita told People: "We've really cut back a lot on sugar, and we find time in every day to exercise. We actually walk and hike together. We're not going to be doing duo, tantric yoga, or whatever.
"When [you] were younger, you used to watch what you eat and exercise because you wanted to look really awesome, and now it's because you want to feel really awesome."
The couple recently celebrated their 26th wedding anniversary and can't believe they have been together for so long.
Rita added: "Sadly, on our actual anniversary, Tom was away working. But we celebrated the week before. It was so amazing. We kept just saying it to each other, 'Seriously? 26 years? Where did it go? It's gone so fast.' "
Tom previously admitted he had been advised by doctors he could control the condition - which occurs when the body doesn't produce enough insulin to function properly - if he lost weight.
He explained: ''It's controllable through diet. My doctor said, 'If you can weight what you weighed in high school, you'll essentially be completely healthy and not have type 2 diabetes.' And I said, 'Well I'm going to have type 2 diabetes then.' ''

Mickey Rooney's eight children have filed a legal bid to contest his will.
The late actor bequeathed his entire modest $18,000 estate to his stepson and carer Mark Aber but his biological kids filed paperwork with the Superior Court of the State of California on May 8 alleging Mark took advantage of him during his final days.
The documents have been filed against Michael Augustine, the conservator for the late actor's estate and claim he helped manipulate their famous father - who died last month aged 93 - with Aber.
According to RadarOnline.com, the documents read: "Decedent's health was failing and he was of very advanced age; Respondent had come to be the court appointed conservator of the estate and person of Decedent after a long and traumatic period in his life involving elder abuse.
"During this period, Respondent acted in concert with Aber, Decedent's stepson, who occupied a position of trust and confidence as the caretaker of Decedent and who, during this period, lived with Decedent along with Aber's wife, Charlene Aber, before and up to the time of Decedent's death... Decedent reposed trust and confidence in Aber."
The documents further claim that the conservator and Mickey's step-son were able to convince him what to write in his will.
They continue: "Respondent and Aber were able to and did control and influence the mind and actions of the Decedent to such an extent that Decedent did whatever Respondent and Aber instructed him to do.
"Taking advantage of this trust and confidence, Respondent and Aber suggested and dictated the contents of the Document, arranged for the execution of the Document, and caused Decedent to execute the Document."
The legal bid is asking for the will to be nulled as the children believe it was not drafted in "the free and voluntary act" of their father. They also want to be awarded legal fees.
Though Mickey had just $18,000 in the bank when he died, he is worth more through residuals and royalties.
He disinherited wife Janice because she will receive Social Security and some of his pension benefits, which total about $8,400 a month.