Pia Toscano isn't about to kiss and tell about her relationship with Mark Ballas! The American Idol castoff delivered a beautiful performance of "I'll Stand by You" on last night's Dancing With the Stars while dancer Mark took a spin on the ballroom floor — but when later asked about their relationship, she played coy. Pia wasn't the only talked-about singer that evening; Christina Aguilera and the judges of The Voice also went "Crazy" on stage as they sang the Gnarls Barkley hit. Take a peek at Pia, Mark, and the night's big showstoppers!
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