Britney's Kids Front Row For Birthday Performance (VIDEO)

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Britney Spears turns 27 Tuesday and she started off the day by performing two songs on "Good Morning America" with sons Sean Preston and Jayden James up front watching.

Despite apparent lip-synching, Spears put on a good show, complete with fire and circus performers. At one point during the song "Circus" she approached the crowd and the cameras showed younger son Jayden James, 2, in the lap of a bodyguard and elder son Sean Preston, 3, with her mother Lynne (about 1:45 in).

Spears performed two song from her new album, the title track "Circus" first and then "Womanizer." After the songs, Diane Sawyer and Robin Roberts interviewed the reformed pop star and played multiple birthday wishes from previous GMA guests to Britney, including Reese Witherspoon, a singing Hugh Jackman and Taylor Swift.

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