Video: Pia Toscano Calls Mark "Wonderful" and Sings on DWTS While The Voice Judges Go "Crazy"
Description: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(1:53)