Ian Somerhalder and Nikki Reed weren't the only ones packing on the PDA at a Comic-Con after party last weekend. According to US Weekly, Somerhalder's ex Nina Dobrev and actor Orlando Bloom were seen kissing at Zachery Levi's Nerd HQ bash sponsored by Patron XO Café.

An onlooker told the magazine that Dobrev and Bloom "were making out for 20 minutes" and were very touchy-feely.

"They grinded on the dance floor," a second source said.

Apparently the two have known each other for years after getting introduced through a mutual contact, their manager Scott Wexler. According to sources Dobrev and Bloom have been romantic for a little while now and were spotted holding hands in January.

"Nina has known Orlando for a few years now," the source told US. "She's been out with him in social settings with mutual friends. She's always thought he was an attractive man."

The "Hobbit" actor recently split from his wife Miranda Kerr after three years of marriage and Dobrev ended her romance with her "Vampires Diaries" costar Ian Somerhalder last year. She also briefly dated "Dancing With the Stars" pro Derek Hough.

The source told US that Dobrev and Bloom are just having fun and are not looking to get into a serious relationship.

"She's single and having fun!" the source said.

Somerhalder was spotted at the same party with his rumored girlfriend Nikki Reed. Reports claim that the two were holding hands and kissing and looked like "they were so together."

A source told E! News that Somerhalder and the "Twilight" actress were "hot and heavy" and "weren't hiding their PDA at all."

The pair never ran into Dobrev and Bloom at the party, the source said.