Jessica Biel Cheers on Hubby Justin Timberlake at Taylor Swift Concert

Justin Timberlake and Jessica Biel's Halloween Party Details

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It seems that just about everyone was at Taylor Swift's Los Angeles concert last night, including a few recent celebrity brides and famous brides-to-be. In addition to the usual crowd of raucous Swift fans, celebs poured into the LA Staples center to see the pop star perform: recently engaged Julianne Hough was there, no doubt showing off her stunning engagement ring, with her lady friends in tow, and Jessica Biel was also attendance, but not just to enjoy some "Shake It Off" — the new mom was supporting her husband!

Justin Timberlake. Mid-mic drop. #1989TourLA

A photo posted by Taylor Swift (@taylorswift) on

Timberlake hit the stage with Swift as one of her many — and we mean many — guest performers on her 1989 tour, and an insider tells Us Weekly that Biel, along with her mom Kimberly, was right there, cheering on her man in his first stadium performance since welcoming the couple's first son, Silas, back in April.

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"Jessica was clapping a ton and singing along to Justin's performance. She was clearly loving it!" the source said. "She left shortly after Justin's performance."

Like many of her fans, Swift was super excited about sharing the sage with the former boy band member and heartthrob. "I'm obsessed with his music, you're obsessed with his music. I think it's the only thing in the world everyone has in common," the "Style" singer told the crowd. "He has been a great friend to me. I can't believe I'm about to say this — Justin Timberlake is here!"

While this might be his first stadium show in a while, Timberlake has been performing this summer — just on a much smaller stage. In June, the singer and his wife attended a friend's wedding in Connecticut and, during the reception, Timberlake serenaded the newlyweds with a keyboard rendition of Señorita.

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