Forget those ugly high-waisted pants, Mischa Barton is pushing ugly high-waisted shorts!

The 21-year-old former O.C. star wore out a pair of royal blue high-waisted shorts and her favorite Thomas Wylde cuffed boots in London on Thursday.

Her recent favorite fringe sweater over those two other tops… can we say too much?

High-waisted shorts: TREND or TRASH?

Super svelte Mischa Barton wears out a very hippie-esque fringed sweater in the arms of a mystery male at a Kings of Leon concert on Wednesday in London.

10+ pictures inside of Mischa and her new man..

Mischa Barton almost showing her shave crotch, lucky for her, her panties still on there. Look her sexy legs guys, it’s so beautiful

Minidress maven Mischa Barton promotes Skin Cancer Awareness For Everyone (SAFE) at health & beauty retailer Superdrug in London on Wednesday, in a campaign launched by the Institute of Cancer Research and Superdrug.

“I spend a lot of my life in the sun,” said the 21-year-old actress.

“And I know how important it is to be sun aware and protect your skin. I hope that my support of Superdrug’s important campaign will ensure everyone stays safe in the sun this summer whether at home, on holiday or even on the beaches of California.”

More pictures of Mischa for SAFE inside…

Mischa Barton walks pet pooch Ziggy in the Big Apple on Wednesday afternoon, right before making her appearance at Macy’s Herald Square for the Keds “Be Cool” meet-and-greet.

Mischa is wearing Thomas Wylde cuffed boots in beige nappa leather.

Note: This is the answer to the latest installment of “Celebrity Guess Who?” Congrats to kim for guessing Mischa first! High five!

Mischa Barton bends over, giving airport passersby a little something extra to stare at on Tuesday.

Does that mean she’s not wearing any underwear? Mischa Barton flies commando?

Miss Barton and her pup Pomeranian shih tzu mix Ziggy were catching a flight out of LAX airport.

Gah, it’s those boots again…

20+ pictures of Mischa inside…

Former O.C. star Mischa Barton shows off her ruffled floral bra underneath her wet t-shirt as she grabs dinner at Beverly Hills eatery Mr. Chow on Monday.

Accompanied by pals Kim Kardashian and Carlos Lopez (also BFFs with Nicole Richie), Mischa hit up the Roxy nightclub where comedian Andy Dick performed.

P.S. Mischa, darling. Those boots are hideous.

Fashion plate Mischa Barton arrives for “The Diner Des Tsars” at the Guildhall on Thursday night in London, England.

“The Diner Des Tsars” is an upmarket affair in aid of UNICEF, recreating a famous banquet by Tsar Alexander II in Paris in 1867.

For more/bigger pictures of Mischa in her minidress, CLICK HERE!

London-born actress Mischa Barton wears a black and white pleated ruffled dress as she enjoys a late night dinner out in London on Thursday with a few friends.

Before being chauffeured back to her hotel, the former O.C. starlet stayed hydrated, chugging down some Evian water.

Keds brand ambassador Mischa Barton looks cute in kicks as she helps launch the new line of Nanette Lepore-designed Keds shoes.

The 21-year-old former O.C. star was on hand at the launch event on Thursday afternoon at UK department store Selfridges on Oxford Street in London, England.