Beyonce was spotted in Harlem, NY in a police uniform on Thursday.  She was filming a video for her new song "If I Were a Boy." (see a video clip below)

Earlier this week they R&B diva announced plans to release her highly anticipated third solo album on Novomber 18th, via Music World Music/Columbia.   The first singles, "If I Were a Boy" and "Single Ladies" will be released to radio stations on October 7th. 

Beyonce co-wrote or co-produced all the material, which the label says comprises "her most personal, reflective and revelatory collection to-date." 

Justin Timberlake will appear on the as-yet-untitled album, but additional details about his contributions have not been released.  The two artists recently teamed up to cover the Marvin Gaye/Tammi Terrell classic "Ain't Nothing Like the Real Thing" last Friday at the Fashion Rocks event at New York's Radio City Music Hall.

The new album is the follow-up to 2006's "B-Day," which has sold 3.2 million copies in the United States, according to Nielsen SoundScan.

In related news, Beyonce is also starring in two upcoming films. She will play blues legend Etta James in "Cadillac Records," a release date for which has yet to be announced, and as the wife of a stalking target in "Obsessed," due Feb. 27.

VIDEO: Beyonce in NYPD uniform on the set of new video