...And they even wore some pretty imaginative costumes!

Last night, Hollywood's A-listers got in the Halloween spirit as they all attended Kate Hudson's annual bash in Pacific Palisades.

From Fergie as Elvira and Josh Duhamel as a spooky tuxedo'd ghoul, Jessica Alba dressed as who-knows-who (Cher in pajamas?) to Bradley Cooper as a gorilla in a furry one-piece with girlfriend Suki Waterhouse on the back of his bike, no one seemed to show up sans costume to huge shindig.

Click through the pics to see everyone's outfits!

She looks great!

Miley Cyrus showed off her bright smile and then some on the cover of the December 2013 issue of Cosmopolitan, where she also opened up about whirlwind year.

"Everything is so chaotic and crazy right now and it's so much all at once, but I'm living for it," she said in the issue. "I'm just having the best time ever and everything's falling into place like it's supposed to. Even people who want to hate on me, they can't even shut down the fact that I’m literally what everyone is talking about."

"I don't want to say that I'm on top right now – I feel like I'm kind of an underdog in a cool way. It's almost punk rock to like me because it's not the right thing to do. Like, society wants to shut me down," the Wrecking Ball singer continued in the interview. As for her personal life, she alluded to the fact that she's shifted her focus.

"I need to treat my music like a relationship – give it my time and all the attention it deserves – and that’s my main love right now," she says in the issue. "This is the best time of my life. I'm not going to look back on it and be like, 'I wish I hadn’t been dwelling over a breakup,' you know?"

Lady Gaga continues to be her controversial self as she released some revealing shots of herself as part of a first look at her cover art for her new song Venus.

The 27-year-old singer posed nude as well as bleeding with a scorpion in the series of shots by famed American photographer Steven Klein for new song.

"I wrote 4 hooks in Venus. The snippet is of the first two before the true chorus. The rise before the orgasm. #StopDigitalHate" the Mother Monster tweeted about the latest track from her album ARTPOP.

Listen to the song below!

Chris Brown once again runs into trouble with the law as it's been reported that he was arrested for felony assault in Washington D.C. this morning.

According to TMZ, the 24-year-old singer got into an argument with a man outside of the W Hotel on K Street around 4:30am. Brown then allegedly punched the man in the face after he and a friend photo bombed the singer taking a picture with two female fans.

The victim is in the hospital after suffering a broken nose and could have surgery as early as tomorrow. As for Brown, he and his bodyguard remain in jail today due to D.C. law.

To make matters worse, Brown is still on probation for his assault on Rihanna a few years ago and could face stiffer consequences as could be grounds for a violation.

Even pop stars have their off days!

On Saturday, Britney Spears wasn't in her best form on Saturday when she showed up to her son Jayden's soccer match in an ill-fitting red turtleneck in Los Angeles.

The 32-year-old singer and ex-husband Kevin Federline appeared to be pretty amicable, coming together to cheer on their boy but someone should let her know that t-shirts are another great alternative!

We knew at least one celeb was going to do this!

Paris Hilton paid homage to Miley Cyrus' 2013 MTV Video Music Awards performance the only way she knew how when she showed up to the Playboy Mansion dressed as the pop star for the mag's annual Halloween party on Saturday.

The 32-year-old socialite loves a good party and clearly couldn't pass up the opportunity to emulate popular singer!

Lou Reed, songwriter and guitarist who helped influence the face of rock music wioth his band the Velvet Underground, passed away today. He was 71.

According to Rolling Stone, Reed's cause of death wasn't reported yet it's been known that he underwent a liver transplant in May.

Back in the 1960s and 70s, the Velvet Undergound weren't commercially successful but revolutionized rock with a mixture of thrashing guitar licks and smooth melodies sung by Reed or German model Nico, who collaborated at the request of famed artist Andy Warhol.

Yesterday, Alessandra Ambrosio looked deliciously devilish as she brought her two kids out to enjoy a Halloween festival in Los Angeles.

The 32-year-old Victoria's Secret model switched up her Halloween wardrobe this time around, wearing a red body suit with some denim shorts, horns and a tail while her daughter Anja and son Noah both sported similar red outfits while enjoying carnival rides and feasting on festival food.

Looks like they were "red-y" for some fun!