The pair made their red carpet debut as a couple at the MusiCares Person Of The Year event in Los Angeles on Friday night – just weeks after they are reported to have separated.
The Magic Mike actor also posted a picture of him and Jessie during the event on Instagram, each of them wearing novelty unicorn headpieces.
He wrote: “Gonna watch this unicorn sang tonight. Then we gonna get it in! Horns out!”
In another post, he shared a picture of Jessie, along with the caption: “Sculpture of magic.”
The Do It Like A Dude singer also shared videos of them on her Instagram Stories, including one of them sharing a kiss.
Jessie and Channing were reported to have split in December after over a year together.
They were believed to have started a relationship six months after Channing split from his wife of nearly nine years, actress Jenna Dewan, who he has six-year-old daughter Everly with.
The Hollywood star first appeared to confirm rumours they were dating in November 2018 when he praised her performance at London’s Royal Albert Hall, where he was in the audience.