A week after reports suggested they had married, the pair are enjoying a sun-drenched holiday together - and look every inch the loved-up newlyweds.
Although their wedding rings are not visible in the photo, they were seen wearing them at the airport as they boarded the plane for their break.
The snap shows Ian, 36, in his favourite fedora-style hat giving new wife Nikki, 26, a big kiss...
Alongside the snap, Nikki wrote: "Salty...sandy...sticky...sunburned. The best. I love this human. My human."
Fans responded to the happy pic with messages like: "Completely in love :)" and "You guys look so happy".
After marrying at a romantic sunset ceremony in Santa Monica, California, Vampire Diaries star Ian and Twilight babe Nikki headed to a luxury resort in Mexico before moving on to Brazil.
The day after their wedding, Ian only returned to Twitter once to retweet a message from Ellen DeGeneres wishing them well.
She said: "Congratulations @NikkiReed_I_Am and @IanSomerhalder on your wedding! I'm wishing you two crazy vampires a lifetime of happiness together."
Ian and Nikki's longtime friendship turned to romance last year, and an engagement followed after six months of dating.
Their marriage is Ian's first and Nikki's second. She is divorced from American Idol singer Paul McDonald.
Ian previously dated his Vampire Diaries co-star Nina Dobrev.
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