This is from IMBD about him:

Trivia

Has known Jake Gyllenhaal since kindergarten.

Has ADHD (attention-deficit-hyperactive disorder).

Former frontman of band Kara's Flowers.

Good friends with actress Natalie Portman.

Singer of the band Maroon 5.

Cites The Beatles (John Lennon, Paul McCartney, George Harrison, and Ringo Starr) as his heroes.

Good friends with Jake Gyllenhaal and Billie Joe Armstrong.

briefly toured with Reel Big Fish while guitarist/lead singer Aaron Barrett recovered from a hand injury.

His parents are divorced. He has one brother, Michael, as well as a step-sister, Julia. He also has a little half-brother and half-sister, Sam and Liza

His favorite musical artists are Prince and Stevie Wonder, who he calls his 'spiritual leader'.

He is ambidextrous. He writes and draws with his left hand but prefers his right hand for most of other activities.

Broke his collarbone in 2005.

Owns a Golden Retriever called Frankie.

Resides in the Hollywood Hills with close friend, Gene Hong.

Friends with Adam Brody.

Worked as a writer's assistant on "Judging Amy" (1999) while writing songs for Maroon 5's first album, Songs About Jane.

As a member of Kara's Flower, he made a guest appearance on "Beverly Hills, 90210" (1990), while still in High School.