Britney Spears's little sister posts a photo of herself and daughter Maddie
Credit: Courtesy Jamie Lynn Spears

It’s been a big week for the Spears family.

Britney Spears performed two shows and released her new album. And now her little sister, Jamie Lynn Spears, is celebrating her own milestone: Her 20th birthday.

Jamie Lynn, whose birthday is Monday, took to Twitter over the weekend to share some of her plans.

“What else do you do on your 20th birthday weekend?” she wrote Saturday and posted an adorable shot of herself giving a big hug to her 2½-year-old daughter, Maddie.

Later the same day, Jamie wrote, “Just grilling for Maddie B,” and posted a photo of herself holding tongs and a potholder in front of a barbecue grill.

As for Britney, 29, she also spent quality time with her kids over the weekend. The pop star and boyfriend Jason Trawick took her two boys to Palms Casino Resort in Las Vegas for dinner.