Orlando Bloom and Nina Dobrev were spotted allegedly kissing at Comic-Con last week.
The 37-year-old hunk reportedly locked lips with the 'Vampire Diaries' actress, 25, at Zachary Levi's Nerd HQ party in San Diego, California, on July 25.
An onlooker claimed the pair couldn't keep their hands off one another and "were making out for 20 minutes."
While another added that they were dancing provocatively up against each other on the dance floor.
However, their closeness wasn't a complete surprise to friends as the pair - who were spotted holding hands in January - have known each other for while after being introduced through their mutual manager Scott Wexler.
The source explained: "Nina has known Orlando for a few years now. She's been out with him in social settings with mutual friends. She's always thought he was an attractive man."
Despite the obvious chemistry between the two, it seems they're not looking for anything serious as of yet and are just enjoying their friendship for the time being.
A source close to Nina said: "She's single and having fun!"
Orlando split from his wife of three years Miranda Kerr - with whom he has three-year-old son Flynn - in October last year, while Nina went through two break-ups in 2013.

Russell Brand's girlfriend has been giving Zayn Malik love advice.
Jemima Khan, 40, struck up a friendship with the One Direction hunk, 21 - who is engaged to Perrie Edwards - after bonding during a night out at London's Chiltern Firehouse with Naughty Boy last week.
A source told The Sun newspaper: "Jemima took the boys under her wind and started to dish out some advice. She started warning them about the celebrity circuit and then switched their chat to ladies.
"She told Zayn and Naughty boy - whose real name is Shahid Khan - that they should find themselves a good wife and settle down and avoid getting involved with any gold diggers. It was obviously all tongue-in-cheek as Zayn is loved up with Perrie."
However, the trio's new friendship has come as a shock to onlookers as the posh socialite - who has been dating the comedian since last September - is usually spotted mixing with a "glamorous circle" of pals.
The source explained: "Jemima normally mixes in very glamorous circles so you wouldn't have thought she'd have much in common with Zayn or Shahid but they're all Muslim and spent a lot of time chatting about religion and relationships.
"Shahid and Jemima had become good pals through doing charity work together. He introduced Zayn into the mix after they spent lots of time together working on new One Direction material."

Lady Gaga shares a "special bond" with her dog.
The 'Applause' hitmaker admits she and her French bulldog Asia are able to communicate with each other through the use of various body parts.
Speaking in the September issue of Harper's Bazaar magazine, she told Karl Lagerfeld: "Asia and I have a very special bond. She also talks a lot with her big, beautiful eyes. Her ears are especially large for a Frenchie, and I can tell she's comfy at home with Mommy because her ears are down.
"Asia also loves belly rubs, from everyone, and she lies on her back all the time to let me know!"
The 28-year-old singer admits her four-legged friend, who she adopted in March, has become her "inspiration" in life, particularly with her music.
She explained: "Asia is my inspiration for many things. She has really shown me the importance of living in the moment. If I don't, I'll miss a precious look on her face!
"She is a very romantic and loving animal, and this sort of poetry is what art is all about, I think. Interaction. She loves to sit with me when I record jazz. She never barks or makes noise; she just looks at me with her big ears."

Robert Pattinson thinks his house is a bit "psychotic."
The 'Twilight' hunk is currently renting a property on Mulholland Drive in California, but he admits the home doesn't represent his personality in any way and he tends to stick to spending time in just one room.
Speaking to the UK's Esquire magazine, he said: "My house doesn't reflect my personality. There's, like, no furniture! It looks a bit psychotic. [The house is] weird and a bit cabin-fevery ... but I spend most of my time in one room anyway."
Prior to renting, the 28-year-old star owned a mansion in Griffith Park in Los Angeles, but he sold it for $6.37 million earlier this year because he couldn't deal with the constant paparazzi standing outside his gate.
He explained: "They photographed anyone who came up to the gate, anyone who rang the bell, and they followed any car that came in and out. I used to dress up my assistant as me, and get him to drive off with like five cars following him around for hours."
Robert was initially deliberating returning to the UK following the sale of his home, but he decided against it after realising England wasn't for him anymore.
He said: "My friends are all having kids and stuff, it's a totally different life. And I like people who want to actually make things and do stuff. In England, it's so difficult that most people just give up."

Jarvis Cocker says earning "grudging respect" from the "hard" kids at his school meant more than selling records.
The Pulp frontman admits he has never lost the desire to impress his childhood peers, and was relieved to encounter some recently and come out of the encounter unscathed.
He said: "In some ways you never lose that thing of wanting to impress the hard kids in school.
"I went to a funeral in a rough pub where I grew up, and the worst of the hard kids at school were there and it was like a big achievement that I didn't get smacked.
"They said they recognised me and gave me a grudging respect and that meant an awful lot, probably more than selling a lot of records - the fact that I didn't get my head kicked in."
Though Pulp's iconic album 'Different Class' celebrates its 20 year anniversary next year, the 50-year-old singer insists there are no plans to mark the occasion as he would rather perform with the band only when it feels "right".
He told Britain's OK! magazine: "We've never planned anything out, we seldom talk to each other and I think that's good.
"If we'd been clever and were thinking of marketing then we could have thought, 'It's 20 years since 'Different Class' came out next year' and to get back together then, but that would just be boring.
"I think it's better to get together when it feels like the right thing to do, rather than looking at a calendar. I just like to be vague."

Vin Diesel found playing a tree "challenging".
The 47-year-old actor, who voices the Flora Collasus, Groot, in the new Marvel comic book movie 'Guardians of the Galaxy', struggled to portray the animated character without the use of facial expressions and movement.
He said: "I play a unique extra terrestrial character. I play a tree. When the character was presented to me they prefaced it by saying this is the strangest character we've ever attempted to put on film for Marvel ... and it's a tree.
"For this one I felt like the thespian in me was being challenged.
"To be asked to play a role and not be able to use your facial mannerisms or body physicality to portray that role..."
In stark contrast to the part-animated comic book blockbuster, the 'Fast and the Furious' star is hoping to complete a historical film trilogy, based on the three Punic wars - fought between Rome and Carthage from 264 BC to 146 BC - which he has had in the pipeline for a decade.
He explained: "As so many people know, I want to do this his historical piece. And I want to do the trilogy about the Punic wars it's still something that I have been working on the 10 years and it's something that has to be realised."

Lindsay Lohan is reportedly angry big brands won't give her gifts anymore.
The 'Liz & Dick' actress is said to have been snubbed by clothing companies who don't see the troubled star as a viable face for their campaigns due to her personal issues.
An insider told the Daily Mirror newspaper: "Lindsay and her PA are going mad because nobody will give her any clothes - they don't want her to wear them because she's back on the wagon and isn't looking too good.
"It hasn't helped that she's been pictured with loads of bruises all over her too, recently."
Lindsay was recently spotted cheering on Orlando Bloom after he tried to hit pop star Justin Bieber.
A source recently said: "When Orlando punched Bieber, everyone started clapping. People were shouting, 'What a show! Justin and Orlando fighting. What a show!' Lindsay [Lohan] was laughing. It was amazing.
"The whole table he and DiCaprio were on were clapping. Afterwards, I don't know if people were congratulating Orlando or trying to calm him down."

Alesha Dixon has admitted she would love to return to 'Britain's Got Talent'.
The singer, who starts on the show with David Walliams, Amanda Holden and media mogul Simon Cowell insisted while she is keen to remain as a judge and continue her singing career, the decision is ultimately down to her famous boss.
She told The Sun newspaper: "If I had it my way, I'd be back. But it's up to Simon, so we'll see.
"There's no point being a judge on a show when I'm not doing the thing that got me to that position."
Alesha is currently working on her new album - the follow-up to 2010's 'The Entertainer' - and she claimed it will stay true to her R&B roots.
She added: "I'm in the studio right now. I'm going to Sweden this weekend and America later on.
"My music is definitely always going to have a garage and R&B sound. I always MC so that won't stop, I can't help myself anyway.
"I said at the start of the year that I want a record out at the end of 2014 and I'm still trying to stick to that."

Mary Berry says 'The Great British Bake Off' doesn't want to make people cry.
The TV presenter insisted she and her co-star Paul Hollywood have shunned the cliches of other reality shows by trying to avoid coaxing tears from contestants.
She told the Daily Express newspaper's Saturday magazine: "We try to avoid the tears.
"Other programmes encourage them but if we can see someone in trouble, we will tell the show's presenters Mel [Giedroyc] and Sue [Perkins] and they can go and find out what's happening.
"Mel and Sue play an immensely important part in the programme."
Meanwhile, Paul noted the competition for the upcoming series will be stronger than ever.
He said: "The quality and standard of the bakes this year is awesome. They get better and better.
"The whole pack have moved forward and the atmosphere is very different. They have really bonded.
"The competitive spirit is still there but this year's competitors gee each other up more than I have ever seen before. It's fantastic."
Mary agreed, explaining that the hopefuls were willing to learn.
She added: "The standard is mind-blowing."

Justin Theroux wants a smaller home.
The 42-year-old actor and his fiancee Jennifer Aniston have met with estate agents to discuss selling their Bel Air mansion - which they have spent around $3 million renovating since buying it less than two years ago - because the 'Your Highness' star is uncomfortable in so much space as he is used to more intimate properties after living in New York for so long.
A source said: "Justin is a New York native and is far more comfortable in a smaller space.
"The Bel Air mansion can feel more like a show home than somewhere they can relax together.
"It's not officially listed as Jen's got a property mediator sourcing potential buyers first. She wants to see if she can get a good return on it before placing it on the market.
"If that happens, she's looking into buying a new penthouse in New York and keeping her Hollywood Hills property as an LA base."
The couple are said to already have their eyes on a potential new home - the $3 million Beverly Hills property they rented while their Bel Air mansion was being renovated.
The source added to Britain's Grazia magazine: "The house is luxurious, but feels like more of a home than the Bel Air property.
"And it has happy memories as it's where they got engaged. Justin's spent so much time in New York that the Bel Air house doesn't have much sentimental value for them."

Kristin Cavallari has admitted she's a "freak" about what food she puts in her mouth.
The 27-year-old beauty credits her strict eating plan for helping her bounce back into shape just 12 weeks after giving birth to her second child Jaxon.
Speaking to E! News, she said: "I'm a freak about what I put in my mouth. I'm constantly reading labels and I don't eat any toxic chemicals, so I think that plays a huge role [in the weight loss]."
The former 'The Hills' star also thinks breast feeding has encouraged her weight loss, as well as receiving good genes from her mother.
She added: "I'm breast-feeding, which burns a ton of calories, and I can probably just thank my mama too, you know."
Meanwhile, Kristin admits her and her husband Jay Cutler's eldest son Camden, 22 months, had initially settled into life with a new baby brother around, but things have taken a turn for the worse recently.
She explained: "He's been great, up until the last two days. Yesterday I was feeding Jaxon and he threw a sippy cup at his head and started to kick him, so we're sort of in that phase right now."

Lady Gaga and Madonna are said to have clashed over a performance to mark the fall of the Berlin Wall.
The two pop superstars are both keen to sing at a special event to commemorate the 25th anniversary of the historic collapse which united Germany on November 9.
A source told the Daily Star newspaper: "Madonna and Gaga are equally desperate for the honour of performing.
"They both like to think of themselves as very political, and will also have new albums to promote by then."
The pair have clashed in the past over claims the 'Applause' hitmaker has copied Madonna's image, and it is said the 'Papa Don't Preach' singer is the favourite to perform at the event.
The insider added: "It could reignite their long-running feud as the date draws nearer because neither are used to being told no.
"However, it's highly likely organisers would choose the Queen of Pop over Gaga, if push came to shove."
In the past, Madonna branded her rival "reductive" following accusations Gaga's hit 'Born This Way' was a rip-off of her own track 'Express Yourself'.