Rihanna's See-Through Top & Pink Hair -- Clips & Nips

It was a little chilly at Staples Center last night ... just ask Rihanna.

While the Oklahoma City Thunder/Los Angeles Clippers game was the main attraction, the real show was going on in the stands ... where a braless RiRi strutted around throughout the game.

With her pink hair and a tight white tank top, she made the night more memorable than Blake Griffin and Chris Paul did.