Rihanna was spotted heading to a meeting at the Def Jam offices in Manhattan today after her concert at Nassau Coliseum last night.  Pics of her rocking her sheer white button-down and jeans, and joking around with her mom and grandma backstage last night, when you read on...

Rihanna spent her day off today rocking her sexy version of jeans and a white shirt with her nude pumps and a Fendi clutch today while hitting up a meeting in NYC:

Nice.  Her next stop is the IZOD Center in New Jersey on Thursday. So she rolled by her label Def Jam's offices to plan for her fall promo, according to her Twitter.  She also showed she's a BieberBabe:

And while on stage last night on her Long Island stop of the LOUD tour, she shouted out her mom, Monica Fenty, and grandma for being in the audience.  She told the crowd while laughing, "My mom and my grandma are here tonight!  I'm a bad b*tch...but those are some badder b*tches.  I'm scared of them."

And she snapped some pics with them backstage:

Ha!  Only Rih.

Fun times.

Pics via INF/Splash