Posted on Wed Apr 27th, 2011 10:52am PDT
Pia Toscano belted out "I'll Stand By You" on Dancing With the Stars last night, and backstage, boyfriend Mark Ballas gave her a hand ... on her rear. Horizontal mambo, anyone?
The sexy songbird nailed her DWTS performance, and no doubt, she was pumped to see Mr. Ballas dancing while she performed on stage.
See Pia's incredible performance ... after the jump.
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