Pop star, Rihanna who was among the famous celebrities that attended Beyonce and Jay-Z's Oscar after-party at the Chateau Marmont in Los Angeles on Sunday night, took to Instagram to show off her stylish look to the event.

The 31-year-old Barbados singer rocked an Alexandre Vauthier Leopard Ruffle Mini Dress which she paired with black heels.

At the party, RiRi was joined by friend and once-rumored fling Leonardo DiCaprio, Emilia Clarke, Katy Perry, Orlando Bloom, and more.

Her billionaire boyfriend Hassan Jameel was not photographed with her, but at a party that exclusive and secret, it's not out of the question he could've quietly been there, too.

Regardless, he and Rihanna just had a public date last week, so they're going strong.

See more photos below.

Rihanna rocks sexy leopard Ruffle mini dress to Beyonc? and Jay-Z?s Oscars after-party (Photos)Rihanna rocks sexy leopard Ruffle mini dress to Beyonc? and Jay-Z?s Oscars after-party (Photos)