Inside Justin Timberlake & Jessica Biel's Star-Studded Engagement Party

The couple celebrated their impending nuptials with a party attended by A-list friends including Ellen DeGeneres, Portia de Rossi and Amy Adams

Justin Timberlake and Jessica Biel are keeping their engagement low-key -- except when it's time to celebrate! On Saturday, Justin and Jessica threw a lavish cocktail party to celebrate their impending nuptials, with around 100 guests showing up to dance, drink and toast the happy couple's future.

The very exclusive event took place in the backyard of stylist Estee Stanley (who collaborated with Justin on his home goods collection). A live blues band and DJ entertained the crowd, which reportedly included Ellen DeGeneres, Portia de Rossi, Amy Adams, Timbaland, Justin's former bandmates Lance Bass and JC Chasez. and Jessica's parents Kimberly and Jonathan.

"Justin and Jessica arrived at the party looking very excited," a source told People. "Jessica was stunning in a long dress with her hair down."

Biel, 30, wore a leopard-print halter dress with hot pink accessories, and Justin, 31, showed up in a black suit and fedora. The couple "danced and looked very happy" while the deejay spun music by Madonna, Whitney Houston, Usher and (of course) Michael Jackson.

"Jessica and Justin were mingling both separately and together throughout the party," said Us Weekly's source. "Jessica seems to be very close with Justin's friends and vice versa. You can see that they have been dating for a long time and really know each other's friends and family well."

After the dancing, a few of the guests gave speeches -- and surprisingly, Timbaland is the one who got Justin emotional.

"You could tell that they have a very special friendship," a witness told People.

Sounds like a blast! Of course, the party is just a preview of the actual wedding, which is rumored to be in September. In an interview Thursday, Lance Bass said he was already looking forward to the main event.

"[Justin's] like my brother, so there's no question [about whether or not I'll make it to his wedding]," Bass told Us. "Any time you get to travel, it's fun!"

Biel and Timberlake haven't made a formal announcement about their engagement, so they're unlikely to spill details about the wedding. However, Biel has been spotted trying on dresses in Paris and wedding bands in New York City -- and the couple has reportedly been scouting locations in Italy. May we suggest George Clooney's house?

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