1213_drab_launch Dreadlocks, watercolor palazzo pants, a Christmas tree -- Lady Gaga is wearing it all this week!

 The "Art Pop" singer continues to take the top spot on our toodrab list. She walked the red carpet at the Capital FM Jingle Bell Ball in London on Sunday wearing a lacy black bra, starfish trouser suit and sky-high platforms. Mother Monster topped off the look with platinum blonde dreadlocks down to her knees.

Just when you thought her style couldn't get any more over-the-top, Gaga stepped out dressed like a Christmas tree!

The songstress was spotted in London on Monday, donning quite the Christmas ensemble, complete with a green wig, red jumpsuit and a tree hat featuring ornaments and a star. This is just too much -- even for her.

Lady Gaga wasn't the only pop starlet to commit a crime of fashion.

Katy Perry seemed to be channeling Big Bird this week! She was snapped in London on Tuesday, rocking a yellow fur coat, a blue striped mini dress and black thigh-high boots. The singer added a 70s-inspired gold Chanel belt to the ensemble -- as if she needed to add anything to this mismatched mess!

And, Paula Abdul took the puffy sleeve trend to a whole new level!

The singer walked the red carpet at "Trevor Live LA" on Sunday, sporting a red long-sleeved mini dress with GIANT sleeves. She looked the she was wearing lobster claws!

But they weren't alone -- see more of this week's worst dressed stars in the gallery above!

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