Jamie Lynn Spears‘ daughter is officially a high school grad, and the whole family showed up to support her … including JL’s famous nephew, Sean Preston Federline.

Spears’ eldest, Maddie Aldridge, walked across the stage in Hammond, Louisana to collect her diploma on Friday … flashing a huge grin as the crowd cheered for her.

The moment had Jamie looking emotional — her little girl’s all grown up — and taking a ton of pics, like every other parent in attendance, we imagine.

Jamie Lynn had Maddie when she was just a teenager … leaving Hollywood to raise her. She’s opened up about her team wanting her to terminate the pregnancy — so there’s certainly an added layer of emotion here.

As for Maddie’s cheer section … Maddie’s grandfather, Jamie Spears, sat in his wheelchair nearby, and Maddie’s stepfather, Jamie Watson, and sister, Ivey, were also there.

Sean — Britney Spears‘ eldest — flew out to cheer on his cousin … holding a sign which read, “Look Who’s Graduated.” He spent Christmas with Jamie Lynn’s clan, so it’s not a total surprise to see him here. Jayden James apparently couldn’t make it.

Britney herself didn’t show either … not surprising given her tense relationship with Jamie Lynn — who she called a “total bitch” in her 2023 memoir “The Woman in Me.”

Sources told us at the time Jamie Lynn wasn’t sweating her sister’s trash talk — because each comment meant at least Britney was alive.