While Britney Spears was busy celebrating her comeback over the weekend with a new documentary, younger sister Jamie Lynn Spears was getting ready to celebrate her 20th birthday with adorable daughter Maddie Briann, 2 1/2.

"What else do you do on your 20th birthday weekend?" she tweeted Saturday with the pic of Maddie playing dress-up.

Spears, who turns 20 today, has largely stayed out of the spotlight since she had her daughter. Although the Zoey 101 star was once engaged to Maddie's dad, Casey Aldridge, the couple broke up last year. But now it seems that she's poised to return to the spotlight with a new album, which she's quietly been working on while playing single mom to Maddie in Louisiana.

It seems as if Jamie Lynn's excited about her future. Today she tweeted, "Goodbye teens... HELLO 20's!!!"