VIDEO: More drama for Rihanna. First she bolts off stage to throw up during her concert, then goes on a foul-mouthed rampage on Twitter after a racist attack! RIHANNA IS NO STRANGER TO A LITTLE BIT OF DRAMA, BUT YOU'RE NOT GONNA BELIEVE WHAT HAPPENED DURING HER TOUR STOP PORTUGAL. WHILE PERFORMING IN LISBON, RIHANNA FELT A LITTLE QUEASY, SO SHE RUSHED OFF STAGE AND LATER TWEETED: "PORTUGAL tonight was LEGENDARY!!! .... Yep! i ran off stage to throw up, halfway thru Whats My Name...made it back juuuust in time for RudeBoy GROSS...AND OF COURSE, THE FUN DIDN'T STOP THERE. LATER IN THE NIGHT, RI TOOK TO TWITTER AGAIN FOR A FOUL-MOUTHED RANT AIMED AT ANOTHER HOTEL GUEST IN THE PORTUGUESE CAPITAL. AND UM...WE'LL CLEAN UP THE LANGUAGE FOR YOU... SHE TWEETED: "I just met the most racist (dude) EVER!!! This man said the craziest (stuff) about black women: called us dogs, (UM FLOOZIES), we don't look like (STUFF). We don't belong in the same hotels... needless to say, the (uh... anger) in me came out! Bajan accent and all! Lol!" WHOA. LESSON LEARNED: DON'T MESS WITH RIHANNA! HOPE THINGS GO A LITTLE SMOOTHER WHEN HER LOUD TOUR HITS LONDON THIS WEEK.