Ian Somerhalder is engaged to Nikki Reed, but apparently that isn't stopping the PDA with his former flame and costar Nina Dobrev.

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Somerhalder and Dobrev met on the set of their hit CW show The Vampire Diaries and they began to date, with Somerhalder confirming their relationship in 2011 to Us Weekly.

They ended their relationship in 2013, which Us Weekly reported.

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Somerhalder has been with Reed since mid-2014 and they just got engaged as reported by People. The couple confirmed their engagement on Jan. 15.

A source revealed, "They're so happy!"

On Tuesday, however, Hollywood Life reported that a source on the set of The Vampire Diaries has noticed that Somerhalder and Dobrev are very touchy with each other.

"Nina and Ian were very touchy in between takes," the source told the site, adding, "Nina walked in and sat next to Ian on the pew. When she sat down, she immediately leaned her head on his shoulder and just sat there for a few minutes until it was time to roll."

The source also revealed that the costars didn't appear to be trying to get into their loved characters, Elena Gilbert and Damon Salvatore. They looked "awfully touchy" off-camera.

The site previously reported that Somerhalder is directing this episode.

Somerhalder has been posting a lot of pictures from his directorial debut on his Instagram.

Shooting ended yesterday. He documented it with, "Last shot!"

 Last shot! The time- 23:23 Thank you all- wow. Killer day

Fotka zveřejněná uživatelem iansomerhalder (@iansomerhalder), Led 27, 2015 v 8:34 PST

Catch The Vampire Diaries on Thursdays on The CW at 8 p.m. ET.