Although she had small film and television roles, she tried out for WB's Popstars in 2001. Since then, she has starred in more prominent and well-known roles.

Manning and her brother Killian formed Boomkat and their debut album Boomkatalog.One was released on March 18th 2003. She sang a rendition of "I'll Take You There" with Tweet in a Gap commercial, and a Boomkat song was included on the 8 Mile soundtrack.

On September 22, 2005 Manning discussed her "out of body" experience as one of 140 passengers on JetBlue Airways Flight 292. Speaking as a guest on Craig Ferguson's late night talk show, she explained:

"When we saw our plane on TV as 'breaking news'... it was the most surreal, out of body experience I ever had... I just composed a little something so that if anything happened [family members] would know that our last goodbye wasn't on the phone... A lot of the women of course were crying... There was a gentleman across the way who was writing in his journal and crying, and seeing that isn't easy."

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