Paris Hilton [1] takes Halloween [2] very seriously. Although there have been a lot of stars sharing costume snaps on Instagram [3], no one posted as much as the former-reality-star-turned-DJ over the weekend. It all started on Friday night, when Paris debuted her Minnie Mouse costume in a series of shots before attending the popular Casamigos party [4]. Come Saturday, she went nude for a snap showcasing a mask. But perhaps the most elaborate costume of them all was unveiled early Sunday following Seth MacFarlane's birthday celebration. Paris donned a sexy Playboy Bunny ensemble for the occasion, keeping with the theme of costumes we've seen her wear in years past [5]. Keep reading to see Paris's new looks, and then check out all the new celebrity Halloween costumes [6] from the weekend.

Paris partied with Ashley Benson and producer Heather Parry.

Paris Hilton [7] went nude and wore just a mask for a sexy snap.

Paris Hilton [8] had a picture-perfect Minnie Mouse costume.

Paris posed with a guest dressed as Karl Lagerfeld.

Paris's friend went with a more casual look.

Paris Hilton [9]'s Minnie Mouse outfit was in stark contrast with other partygoers' getups.

Paris Hilton [10] showed the backside of her Playboy Bunny ensemble.

Paris Hilton [11] took a sultry snap with her mask.

"So much fun being Minnie Mouse last night! I love Halloween [12]!" Paris captioned this picture.

"Happy Birthday @MacfarlaneSeth! Such a fun birthday party last night. Wishing you the best on your special day," Paris wrote on Sunday.