UPDATE: Swiss authorites just announced they will NOT extradite Polanski back to the U.S.

Swiss authorities will announce Monday morning if Oscar-winning director Roman Polanski will be extradited to the United States to face child sex charges, RadarOnline.com has learned.

Polanski - director of such critically acclaimed films as The Pianist and Chinatown - pleaded guilty to having sex with a 13-year-old girl back in 1977 but fled to Europe before he could be sentenced.

He was arrested in Switzerland last year and has been fighting extradition to the U.S. ever since then.