Rihanna took her grandpa to Philippe Chow in Santa Monica on Monday night to celebrate his birthday, and the R&B superstar happily posed for photos after the duo noshed on birthday cake and champagne.

Later on Ri Instagrammed a photo of the two and wrote, "I took Bravo out to dinner, this guy eats nothing there! So this is the pic of him waiting on the fried chicken wings to be delivered from up the street! Ghetto! Lol #birthdayisms We've been leaning on him for generations! #Bravo #86." Ha!

And speaking of Instagram, we're so glad Bad Gal RiRi is back on the social media site! After being absent for 6 months, she blew up our Insta feed on Saturday when she posted a number of Halloween pictures and snapshots from her new Elle magazine spread. We missed her racy selfies and hilarious hashtags!