If you are talking about the theme song, no, but she does sing 'That Christmas Feeling' (Which i think is the song you meant)
it is from the phineas and ferb christmas special.
Nope neither is her mom, Charlene Doofenshmirtz.
thirty minutes
Ferb and Vanessa
Vanessa Doofenshmirtz on the show Phineas and Ferb is voice acted by Olivia Olson.
Phineas, Ferb, Isabella, Baljeet and Buford were all shown in the video, However, Olivia Olson, Who voices Vanessa Doofenshmirtz, sang the song.
Phineas and Ferb - 2007 Phineas and Ferb Christmas Vacation 2-24 is rated/received certificates of: Australia:G
vanessa's boyfriend
Phineas and Ferb - 2007 A Phineas and Ferb Family Christmas 3-14 was released on: USA: 2 December 2011
Yes he does. He married Vanessa but vanessa also have a crush on Johnny her classmate.
Phineas & Ferb Christmas Vacation (Premiere) ABC family - December 18th, 2009, 6pm Phineas & Ferb Christmas Vacation is acually premiering on December 11th, 2009, 8/7 central
Doofenshmirtz