Actor Matthew McConaughey and his girlfriend, Camila Alves, attended the 9:30 p.m. performance of "Mystere" by Cirque du Soleil at Treasure Island on Monday.

The couple entered the showroom unnoticed, said Cirque publicist Karin Tomcik.

Following the show, they went backstage to meet the cast and congratulate them on the show.

Tomcik said the couple also saw “O” at Bellagio on Sunday night.