Let's make this birthday one to remember.

46 years old (Born on December 10, 1978)

Actress; She is famous from Girl.

Sister-in-law of Ben Affleck and Jennifer Garner. Is a vegan. Was a member of the (now defunct) quasi-religious alternative band "The Causey Way" (along with her elder sister Rain Phoenix). She played keyboards and sang back vocals, occasionally. In keeping with the pseudo-religious "Causey" theme, each band member, when they were inducted, was given a new Causey name. Summer`s Causey name was "Sum Sum Causey". Together with business partners Odessa Whitmire and Ruby Canner, Summer opened a West Coast branch of her fashion boutique Some Odd Rubies. The new store is located in Los Angeles. Competed with her sister, Liberty Phoenix, for the part of "Candi" in Russkies (1987)

Born at 2:34 AM EST

Named her son Indiana. Her late brother, River Phoenix, played young Indiana Jones in Indiana Jones and the Last Crusade (1989).

Summer and Casey became the parents of their second child, a boy [January 12, 2008].

Gave birth to son, Indiana August, May 31, 2004 in Amsterdam

Often works with good friend Clea DuVall.

Her name, Summer Joy, represented her families reaction to being back in the United States after leaving the religious cult, The Children of God.

Opened a recycled vintage clothing boutique on Manhattan`s Lower East Side called "Some Odd Rubies" which she co-owns with Odessa Whitmire (Matt Damon`s ex-girlfriend) and Ruby Canner (a childhood friend). [May 2003]

Welcomed second child, son Atticus Affleck [November 2007] with Casey Affleck.

Attended New York University`s Tisch School of the Arts film school. [January 1997 - May 1998]

Is a member of "The Paper Cranes", an alternative band that plays the New York City club scene. She plays the Rhodes, piano and guitar. They have released an EP and have plans to produce more. Her sister, Rain Phoenix, is the band`s lead vocalist. "Paper Cranes" plays mostly shows in Gainesville, Florida.

The name of her store (Some Odd Rubies) is a play on the owners` names (Some for Summer, Odd for Odessa, and Rubies for Ruby).

Sister of River Phoenix, Joaquin Phoenix, Rain Phoenix and Liberty Phoenix.

April/May 2002: Appeared at London's Garrick Theatre, in "This Is Our Youth", alongside Matt Damon and Casey Affleck.

Wrote/Played some piano pieces on her sister Rain Phoenix`s new CD.

Appears in Girl (1998) with Sean Patrick Flanery, who, like her brother River Phoenix, played the young Indiana Jones.

Gave birth to son, Indiana August, May 31, 2004 in Amsterdam.

Became engaged to boyfriend actor Casey Affleck over Christmas 2003.

Her brother, the late River Phoenix, played the young Harrison Ford in Indiana Jones and the Last Crusade (1989). Her soon-to-be brother-in-law, Ben Affleck, played the younger version of Harrison Ford`s character in The Sum of All Fears (2002).