Did Justin show Rihanna his abs?

While out to dinner with Rihanna and pals in New York City, Justin Bieber bragged about how hard he's been working on his abs. No one took him seriously, but eventually they jokingly told him to show them off so he lifted up his shirt in front of everyone! "Justin Bieber just flashed me his abs in the middle of a restaurant!" Rihanna tweeted. "Wow! He actually had a lil 6 pack Sexy, LOL!" Now that's how you get your crush's attention.