“Ally McBeal” star Lucy Liu has signed a seven-figure deal to star as the third angel opposite Drew Barrymore and Cameron Diaz — who are each reportedly receiving somewhere between $12 million and $15 for their participation — in the big-screen version of the 1970s TV series “Charlie’s Angels.” The casting of Liu follows weeks of intense negotiations to juggle the filming of the movie with the schedule of “McBeal.” Liu will act in both productions simultaneously. Liu’s casting follows several months of searching for the third angel after negotiations with Thandie Newton fell apart. Other names in the casting hopper included Gwyneth Paltrow, Victoria “Posh Spice” Beckham, Geri “Ginger Spice” Halliwell, Angelina Jolie, Jada Pinkett-Smith, Michelle Yeoh and Jenny McCarthy. Principal photography on “Charlie’s Angels” begins Dec. 6, with music video director McG making his feature film directorial debut. Still to be cast is the key role of Bosley, which Bill Murray reportedly has rejected.