Where were Beyonce and Jay-Z on Grammys Sunday?

On a pizza date in Brooklyn!

Although Jay-Z was nominated at Sunday’s 54th Annual Grammy Awards at the Staples Center in Los Angeles, he and wife Beyonce sat out the proceedings attended by peers like Lady Gaga, Katy Perry, Taylor Swift, Rihanna, Adele and others.

Instead, Beyonce, 30, and Jay-Z (real name: Shawn Carter), 42, took a Maybach from their home in downtown Manhattan’s Tribeca neighborhood to the cute Carroll Gardens section of Brooklyn — where they tucked into pizza at their favorite posh pizzeria Lucali.

Leaving one-month-old daughter Blue Ivy at home, the music super couple “were just like a regular couple talking and whatnot,” a witness tells Us Weekly, adding that other patrons failed to notice them. “They were sitting in front of the place closer to where they make the pizza.”

“Love on Top” singer Beyonce made sure to bid goodbye to the eatery’s owner and waitress as they departed.

The fellow diner even congratulated Jay-Z on Blue Ivy’s recent arrival. “He said, ‘Thank you,’ shook our hands, and said ‘Have a good night.’”

(In absentia, Jay-Z and collaborator  Kanye West won the Grammy for Best Rap Performance for “Otis,” from their Watch the Throne album.)

The couple surprised fans worldwide Friday night when they posted the first-ever pics of Blue Ivy on a brand-new Tumblr site.

Explained their close pal, stylist June Ambrose: “B really really thought about this,” Ambrose told Us Saturday, “and she really wanted to do it this way. She just couldn’t imagine selling pictures of her baby.”

And the pictures are “accurate,” Ambrose added. “A girl with big full lips, she’ll be a supermodel, I can’t wait! And her eyes — she’s gorgeous!”