Another day, another celebrity confesses to once being a meth head. Earlier this week, it was Jodie Sweetin of “Full House” who came clean about her drug use. Now tennis legend Andre Agassi is confessing that, back in the late ’90s, he used meth, too. In his autobiography (out Nov. 9), Agassi explains that he was stressed over not playing well and his rocky relationship with Brooke Shields. He was sitting on the couch with his assistant, who asked Andre if he wanted to get high.