is set to join longtime pal Usher onstage at his halftime show on Sunday.The singer, 43, who collaborated with Usher, 45, on 2004 number one single My Boo, was spotted rehearsing with the star inside Vegas' Allegiant Stadium on Thursday, reports .Usher has been teasing a variety of mystery surprise guests - and is - and recently told People he wanted Lil Jon and onstage with him for Yeah!
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