Pics of the week: Janet, Ciara, Rihanna, Cassie + Mariah

This week, Janet Jackson made her first public appearance at her official 'State Of The World' tour after party in LA.

Her weight loss is insane!

Janet and Ciara also hung out together with their sons at Disneyland in Anaheim, California. Can we get a dance video?!?!

Cute.

Cassie hung out with bf Diddy and his mama at Derek Jeter's Welcome To Miami Dinner Hosted By Diddy:

Not feeling the ensemble, but she's beautiful.

Rihanna dons 3 different looks while out in NYC this week. She hosted a pep rally to celebrate the launch of her latest Fenty Puma collection at Bloomingdales on 59th Street:

Slay.

Mariah Carey and boyfriend Bryan Tanaka enjoy a dinner date at Mastro's Steakhouse in Beverly Hills:

She really needs a stylist!