Are you going to be able to keep this up, Tay?

The cavalcade of celebrity guests joining Taylor Swift onstage continues, and girl is putting a lot of pressure on herself to keep escalating who she brings out. At last night's L.A. concert, Swift and Beck sang his song "Dream" with St. Vincent on guitar. If this was a bid for street cred, it's working. 

And John Legend sat at the piano to play his song "All of Me," with the two stars alternating lyrics.

Sources: Time