Jessica Biel and Justin Timberlake
Richard Young/REX USA; Jonathan Leibson/Wireimage)
and Jessica Biel
were both in Las Vegas over the weekend, but not for date night.
Timberlake made it a guys' evening out on Friday, kicking off the festivities at Yellowtail Japanese restaurant and lounge inside the Bellagio hotel.
Coming in around 10 p.m., the newlywed
went incognito, casually dressed – and wearing a cap – to the point that no one in the restaurant seemed to recognize him. Seated in the main dining area, he did not appear to get any special treatment, though he seemed to be having a good time, munching on sashimi made by Chef Akira Back, and chatting and laughing with his pals. At one point, his hit song "Suit & Tie" came on.
While Timberlake's night looked low-key, his wife, who was dining across the casino at Fix, appeared to have a much livelier evening.
In town for a friend's bachelorette party, Biel and her gal pals munched on the eatery's specialties, including tuna tartare and wings.
On Saturday night, Biel followed in her hubby's footsteps and dined at Yellowtail. Sipping on sake, Biel seemed in good spirits.
But it wasn't until after the meal that the party really got started.
The actress and her female friends made their way to 1 OAK nightclub at the Mirage Hotel and Casino, where an onlooker tells PEOPLE they sat at a VIP table stocked with vodka, Champagne and fireball cinnamon whiskey. The group partied until after 3 a.m.
– Dahvi Shira