Adele thanked Starstruck judge Shania Twain for hiding at her Vegas show - admitting she would have "self-combusted" if she'd known the singer was there.
The Man! I Feel Like a Woman! star, 57, rocked up at the mum-of-one's residency show in Sin City along with a host of famous faces.
Adele, 34, is one of the world's best-selling artists, but when she saw Shania at the end of the gig, she couldn't contain herself.
Posting a pic of the Canadian star sitting in the front row, sporting a hat, the Tottenham-born singer wrote on Instagram : “Thank god you had a hat on @shaniatwain. I would have self-combusted had I seen it was you!!
“I adore you, I can’t believe you came to my show.”
Shania was joined at the sold-out concert by rapper Stormzy and Adele's partner Rich Paul.
Adele has just completed the second weekend of her residency at The Colosseum venue at Caesars Palace, having cancelled the gig earlier this year, telling fans it 'wasn't ready'.
After months of uncertainty, Adele finally announced the new dates for the shows, which kicked off on November 18.
As she returned the stage, the singer, looking resplendent in a black velvet frock and oodles of diamonds, told audiences the show “looked just like how I imagined” and thanked them for “coming back to me”.
Adele’s residency at Caesars Palace had originally been due to begin on January 21, running until April 16.
Her new show is scheduled to run to March 25, with the 24 rescheduled shows as well as eight extra dates.
The star recently urged her fans to head to the bar during in Sin City, telling them they will enjoy her songs more if they’re drunk.
“Go and order some drinks… the drunker you are, the better I am," she advised.
Adele, who previously revealed she never drinks while working, later thanked the audience for sticking by her having delayed her residency by 10 months after axing the original with just a day’s notice.
The star is thought to be earning £500,000 a night and told the excitable crowd: “I worked my absolute a**e off for this. I couldn’t have done that other show and you wouldn’t have liked it either, I’m telling you that.”
Last week Adele left fans speechless as she disappeared from the stage during her gig.
Ticket-holders couldn't believe what they were seeing as the Hello star completely vanished under a flurry of pink confetti as the show came to an end.
Adele had been singing the final song of the night, Love Is A Game, when the confetti rained down on her, before leave an empty stage.
"I'm blowing my brains, I don't sleep in days trying to figure it out," one person tweeted after the show.
While another gushed: "I was all cheering loud and jumping and then I was a full stop and said 'WHAT, how, where!!!! Ahhhh so COOL!!!!!'"
