We figured something was up when Lady Gaga traveled to Las Vegas this weekend to take in one of Britney Spears' residency shows. Turns out we were right.

The long-hoped-for Gaga x Brit Brit duet appears to be happening! The pop music gods have smiled down on us.

A source told Us Weekly that the two pop starlets solidified their plans over the weekend.

"It'll happen soon," the source with knowledge of the situation said. They even discussed the matter at the Feb. 1 gig. A witness at the show said that Gaga tossed roses at Brit during 'Till the World Ends' and Brit blew her a kiss. Ooooh, sexy.

We hope they blow kisses at each other in the studio and in the video whenever this epic collabo happens. This is up there with the Shakira x Rihanna pairing and the oft-discussed Rihanna x Katy Perry duet!

Brit mentioned during an online chat with her Britney Army that she had designs on a duet with Ma Monster, saying, "I would do a duet with Lady Gaga. I think that would be a lot of fun. I think she's very different and interesting and intricate, and I like her as an artist."

Gaga shared the sentiments, tweeting: "Let's do this b---h, it's time."

It's Gaga x Britney, b---h. Bring it, ladies.