Justin Timberlake, Jessica Biel

Stephen Lovekin/Getty Images

When you're Justin Timberlake and Jessica Biel, you can't really let the summer go by without throwing one awesome engagement party, right?

Just a few weeks after showing off her engagement ring on the Met Gala red carpet (and giving us one awesome smooch via the Lakers' Kiss Cam), Biel and her hubby-to-be celebrated their impending nuptials Saturday among family and friends.

So, what went down?

While the super-private couple is keeping most details of their shindig under wraps, we do know the party took place in the backyard of designer/stylist Estee Stanley's home (she and Timberlake have a home line together) and about 100 people attended.

A source told E! News that Lance Bass and Ellen DeGeneres were among party attendees who enjoyed live music from a blues band (and a DJ later in the evening).

And while the couple has yet to discuss their engagement or wedding details with the media, a source tells us the dashing duo is set to tie the knot in September. 

We cannot wait.

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