Here's one fashion trend we can't embrace -- the pajamas look.
Jessie J. stepped out in a flannel set and sneakers. Had she not done her hair, it looked like she just rolled out of bed and grabbed a mismatched leopard print bag.
Russell Brand also appeared to do the pj bottoms-sneakers combo, but the most disturbing thing it looks like there are blood stains on his shirt. Perfect for Halloween, not so much for the other 364 days of the year.
And granted, Rihanna's jammies are nice, but they're still pajamas! We're all for red carpet casual but this takes the look too far. Check out the rest of the week's worst dressed stars, including a boobalicious Olivia Munn and a teen star dressing way too old for her age, below!