Machine Gun Kelly turned 24 this past Tuesday, and his friends surprised him with a celebratory dinner in L.A. In true MGK fashion, the table featured a few porn stars, his boys, Mod Sun and accidentally…Rihanna! The Bad Gal happened to enter the restaurant and pass Kels’ table, and since the paparazzi were on her as usual, they managed to capture Kels in the background. LOL! More pics in the gallery.