Find Out Which 'Vanderpump Rules' Cast Member DMs With Rihanna! (Exclusive)

Rihanna, Jennifer Lawrence and Lady Gaga are well-known fans of the Bravo show, so naturally, ET has to ask the cast about their celeb superfans at the DailyMail.com and Daily Mail TV Summer Party at Lisa Vanderpump, Tom Schwartz and Tom Sandoval's new bar, Tom Tom, in West Hollywood.