chords poker facePoker Face (Glee Cast Version) piano chords?

My friend and I want to cover the Glee version of Lady Gaga's "Poker Face" but we can't figure out what key it's in because its different than the original. Piano chords can give us enough information to figure out the rest, so if anyone can tell us what key its in or some piano chords for that version we would really appreicate it!
Here are the chords as Ichords poker face hear them. Feel free to contact me if anything sounds wrong and I'll try to get it right.
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(I want to hold 'em)
Bb |Dm/A |Ddim/Ab |Eb |
Bb |Dm/A |Ab |Eb(7) |

(Oh)
Bb |Dm/A |Ddim/Ab |Gb |
Bb |Dm/A |Ab |Gb |

(Can't read my)
Bb |Dm/A |Gm |Eb |
Bb |Dm/A |Gm |Eb |

(Po-po-po)
Bb |Dm/A |Ddim/Ab |Eb |

(I want to roll)
Bb |Dm/A |Ddim/Ab |Eb(7) |
Bb |Dm/Achords poker face |Ddim/Ab |Eb(7) |

(Oh)
Bb |Dm/A |Ab |Eb |

(Oh) (harmony)
Bb |Dm/A |Ddim/Ab |Gb |

(Can't read my)
Bb |Dm/A |Gm |Eb |
Bb |Dm/A |Gm |Eb |

(I won't tell you)
Bb |Dm/A |Ddim/Ab |Gb |

(Just like a chick)
Bb |Dm/A |Ddim/Ab |Gb |

(I'm marvelous)
Bb |Dm/A |Gm |Eb |
Gm |Dm |Eb |Cm Eb |