• BREAKING NEWS ABC shows live and on-demand -- Download the WATCH ABC app!

OTRC: Justin Timberlake and Jessica Biel reportedly throw a star-studded engagement party

Jessica Biel and Justin Timberlake arrive at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (Evan Agostini)

Although Justin Timberlake and Jessica Biel have yet to publicly confirm they're engaged, reports surfaced this weekend that the two celebrated their impending union with a star-studded engagement party.

Over 100 guests attended the party hosted at the home of Estee Stanley, an interior designer who collaborated with Timberlake on the HomeMint collection, according to People magazine. Guests included Ellen DeGeneres, Amy Adams and Timbaland. Timberlake's former N'SYNC band mates Lance Bass and JC Chasez were reportedly in attendance as well.

The two partied until 12:30 a.m and music included a live band as well as a DJ who spun hits like Madonna's "Holiday" and Whitney Houston's "I Wanna Dance with Somebody."

Timberlake and Biel reportedly got engaged in December while on vacation. Timberlake, a pop singer whose acting career took off after the 2010 film "The Social Network," and Biel, who rose to fame with the series "7th Heaven," have never been married before.

The two have been dating on and off for more than four years. Their most recent breakup was confirmed in March 2011. They reunited months later and were seen and photographed together at several Los Angeles parties and promotional events in the fall.

(Copyright ©2018 OnTheRedCarpet.com. All Rights Reserved.)