Also in attendance? Jessie J's mom.
Channing said it was "something special" to watch the performance at the Royal Albert Hall with a packed out crowd, as he stood at the back proudly taking pictures and videos.
The Magic Mike actor took to Twitter Tuesday to give a heartwarming tribute about the singer after going to another one of her shows.
The Price Tag hitmaker posted a snap of the shirtless performers in the raunchy stage production alongside a caption filled with saucy aubergine, flexed biceps and tongue emojis to show her appreciation for her man's art. "Ladies and Gentlemen you don't want to miss this".
The pair recently fuelled dating rumours when Tatum was spotted backstage at the singer's show in Houston, Texas and an image posted by a fan on Instagram supported the theory.
The duo have been linked since early October when they were spotted playing mini golf in Seattle.
Before performing her song "Four Letter Word", Jessie took the time to talk to her audience, opening up about news she received four years ago.
Fertility issues affect so many women, Jessie's bravery in opening up could help others struggling and we love her for that.
Tatum and Dewan announced their spit in April after nine years of marriage.
Sources claim Channing "really likes Jessie" despite their relationship being in its very early stages. "Because it's only been six months since Channing and Jenna separated, this is all very new".
The "World of Dance" host has reportedly started dating Broadway actor and "Shameless" alum Steve Kazee.
While Dewan has played coy about her new boyfriend, she did reveal during a recent red carpet appearance that she's in a good place.