I need a good come-back please?

Ok so this girl i know who used to be my friend always acts like she's all that. i hate to say this, but she's obese and has like 1 real friend, but she tries to act like she's all popular and stuff. well i spent the night with a friend yesterday and she's friends with this other girl too. and we were gonna do a live chat. the gir i spent the night with yesterday posted on facebook " Live Chat. Me and Brianna are going live!" and the other girl posted ugh, no one likes her. what could i say as a good comeback??