From PEOPLE Magazine Click to enlarge
BRETT BUTLER
Grace Under Fire
The twins started on this sitcom in 1993—before they were even 1!

The Suite Life
GUEST STAR

SELENA GOMEZ
Wizards of Waverly Place
Gomez played a girl with a crush on Cody in 2006.

The Suite Life
GUEST STAR

VANESSA HUDGENS
The Suite Life
Return visitor: Hudgens has been on four Suite episodes.

The Suite Life
GUEST STAR

JADEN SMITH
The Suite Life
In 2008 Smith's character, Travis, gave the boys dating tips.

JOHNNY DEPP
The Astronaut's Wife
What did the boys think of the thriller's star Depp? "He was a really cool guy," says Cole.

ADAM SANDLER
Big Daddy
While filming a Big Daddy scene, "I got to see the Statue of Liberty," says Cole. "And Dylan was jealous."

The Suite Life
GUEST STAR

ZAC EFRON
The Suite Life
The 17 Again star had a few flirtatious scenes with London in a 2006 episode.

DAVID SCHWIMMER
Friends
Cole played David Schwimmer's son Ben Geller on the megahit.

MARY-KATE & ASHLEY OLSEN
Dualstar
The Sprouses teamed up with these twins to launch a clothing line (currently on hold).

The Suite Life
GUEST STAR

MILEY CYRUS
Hannah Montana
During Cyrus's Suite Life visit, she licked icing off a cake-covered Zack.

RAVEN-SYMONE
That's So Raven
Both Cole and Dylan appeared on Symoné's show, and then she returned the favor.

ASHTON KUTCHER
That '70s Show
The boys got to tease Kutcher's character in a 2001 episode.

The Suite Life
GUEST STAR

JESSE McCARTNEY
The Suite Life
Zack broke into McCartney's room in the "Rock Star in the House" episode.