Celebs and Their Sibs!

Credit:

Mischa & Hania Barton

They've both suffered hard times: Hania entered rehab at 19 for addiction to painkillers; Mischa was arrested for DUI in 2007 and was placed under psychiatric hold at Cedars-Sinai Medical Center in L.A. last year.

Credit:

Lauren & Breanna Conrad

Breanna followed appeared in season three of Laguna Beach.

Credit:

Miley & Trace Cyrus

"Sometimes I'll wear my brother's jeans, they're really baggy," Miley has said of her older half-brother.

Credit:

Ryan & Mandi Gosling

As a kid, the Mickey Mouse Club alum used to perform as a singer at talent contests with his older sister.

Credit:

Jonas' Younger Bro!

The fourth Jonas Brother is Frankie, 9.

Credit:

Ashton & Twin Michael Kutcher

"A big part of my life [was] kind of looking out for my twin," Ashton has said. (Fun fact: His brother sells retirement plans in Iowa!)

Credit:

Ali & Gena Landry

"While growing up, I was into everything imaginable - pageants, baseball, modeling. I was always running around doing these things. I made Gena do everything for me," Ali has said of her younger sis. "She was my little maid!"

Credit:

Mary-Kate, Ashley, Trent & Lizzie Olsen

Growing up, Mary-Kate has described Trent as "a typical elder brother, he helps us with our homework" and her younger sister Lizzie as "independent."

Credit:

Gwyneth & Jake Paltrow

Her younger brother is a writer, actor and director. He even directed his sis in the 2007 indie Date Night. "It's lovely to work with family," Gwyneth has said. "You feel so well-protected."

Credit:

Hayden & Jansen Panettiere

Her younger bro also is an actor, appearing in such kiddie classics as Ice Age: The Meltdown.

Credit:

Audrina & Casey Patridge

Older sis Casey has tattoos and a baby!

Credit:

Brad & Doug Pitt

Brad's younger bro Doug was named the first Goodwill Ambassador to the United Republic of Tanzania.

Credit:

Ashley & Jennifer Tisdale

Her older sister has starred on MTV's short-lived soap Undressed and Bring It On: In It to Win It.