Authorities are trying to find a 16-year-old Perth Amboy girl who has been missing for three weeks.

Sigrid Beltre was last seen at her home in the city on Dec. 12, Perth Amboy police said in a statement.

She is thought to be with her boyfriend in Camden, but police don’t know his name.

The 5-foot-7, 110-pound teen has black hair and brown eyes. She was wearing a white sweater with a hood, blue jeans and red sneakers. Police didn’t immediately provide a photo of Beltre.

Anyone with information about Beltre’s whereabouts is asked to call police at Perth Amboy police at 732-442-4400 or call 911.

Jeff Goldman may be reached at jeff_goldman@njadvancemedia.com. Follow him on Twitter @JeffSGoldman. Find NJ.com on Facebook.