Justin Bieber FLASHES Rihanna!! WTF?

Written By Sue Jo @SJ_ent

Justin Bieber Flashes His "6-Pack" Abs To Rihanna

Justin Bieber is not really known for going around and taking off his clothes...well that's unless you're Rihanna.  On Monday, Us Magazine reported that Rihanna, 22,  tweeted  "Justin Bieber just flashed me his abs in the middle of a restaurant!

Wow! He actually had a lil 6 pack! Sexy, lol!"

An insider confirmed to Us Magazine that Rihanna and Bieber had dinner together that night in Manhattan with music exec L.A. Reid and other friends.  It's a little weird to me that a 16-year-old would be there, right?

ANYWAYS.

As the night went on, the source says that "Justin started bragging about how he has abs. Everyone started laughing but Justin was serious"(via Us Magazine). So Rihanna and her friends joking asked Bieber to show them. Jokingly huh?

"Justin took off his jacket, glasses and lifted up his shirt," the source explains. "Apparently he does have a little 6 pack!"

"The table was hysterical."

Once Bieber found out that the "Only Girl In The World" singer tweeted the news, Bieber responded by saying, "'You have to say it was sexy if you tweet it. You know it was sexy!'"    I don't even know what to say here. Bieber needs to cool it with the whole, I'm cool so I can do whatever I want attitude. As much as I like him, he's still a 16-year-old boy showing his abs to a 22-year-old. Now if the situation were reversed and they weren't celebrities, that would be a problem.

Read MORE to see Justin's 6pack!!

Cute....but needs a little more work boo boo!