PHOTOS: Smashing Fashion & Other Disasters In The Best And Worst

From NYC to LA, the red carpets were overflowing on Thursday, as stars stepped out in the best, worst and wackiest fashions.

Jennifer Lopez and Marc Anthony teamed up to announce their plans to launch two exclusive lifestyle brands at Kohl’s Department Stores, hitting The London Hotel in Los Angeles dressed to thrill. Jennifer rocked an ultra-glam, gold-belted Gucci frock with Gucci python heels, finishing the look off with Neil Lane diamond and gold cuffs and rings.

David Arquette has clearly been going through a rough patch in his marriage with Courteney Cox, as the two recently announced their separation. And what happens when a man takes some time away from his fashionable significant other? He ends up hitting the clubs in Hollywood every night, dressed in clown-like duds! David hit the town with a little pal of his, wearing a LOVE tank top from his Propr collection, with a single suspender across his right shoulder.

Anna Kendrick, Whitney Port and Jessica Szohr were dressed to thrill at the Los Angeles Launch of IN ADD MINUS. While the Twilight beauty rocked a sassy frock from the totally chic clothing collection, The City star looked statuesque in an eccentric ensemble (which only she could pull off!) and the hot-bodied Gossip Girl showed off her covetable curves in a skintight dress and leopard Louboutin booties.

Ke$ha actually had a style score at the Us Weekly Hot Hollywood Party, but had to ruin the impressive a la mode with a crazy Mohawk, while Nicki Minaj blinded fans outside of The Late Show in NYC with her neon duds.

Who else rocked and shocked on the fashion front? Find out in RadarOnline.com’s daily feature!