They have been compared to each other so many times over the years but now the two blonde bimbos have been hanging out.
Britney Spears and Lady Gaga posed together backstage at her vegas show.
Along with the photo she tweeted:
'Me and Brit Brit <3 #Applause4Britney @britneyspears we had so much fun at your show! (sic).'
She also tweeted:
'She looked so gorgeous, the show was so much fun, and her dad gave us THE BEST BBQ. It was a #MonsterParty! (sic)'
The pair looked so glamorous together and Gaga seemed to really enjoy herself.