"Britney is always very proud of her boys when it comes to school," a source tells PEOPLE

By Karen Mizoguchi
May 31, 2019 02:30 PM

Britney Spears is feeling extra proud this week.

The 37-year-old pop star, who is continuing to focus on her health after seeking treatment at an all-encompassing wellness facility earlier this year, attended 13-year-old son Sean Preston’s eighth grade graduation this week.

“She was very happy to be a part of the graduation,” a source tells PEOPLE exclusively of Spears, who also shares 12-year-old son Jayden James with ex Kevin Federline.

“Kevin and [his wife] Victoria attended as well,” the source says of Federline and Victoria Prince, whom he married in August 2013. (They have two daughters, Jordan Kay, 7, and 4-year-old Peyton Marie.)

“Britney is always very proud of her boys when it comes to school. They take their school work very seriously,” the source adds.

RELATED: Britney Spears Is ‘Very Happy’ to Be Back Home & Will Spend the ‘Weekend with Her Boys:’ Source

Spears has been spending quality time with her boys after leaving treatment in late April as she continues to cope with her father Jamie’s recovery after he suffered a life-threatening colon rupture last year.

“Britney loves her boys and is always so excited to see them. They mostly stay at Kevin’s house, but often visit Britney,” a Spears family source recently told PEOPLE. “The boys are very busy with school, sports activities and homework during the week.”

The last time fans saw a glimpse of Spears’ boys on social media was on Christmas Eve 2018 when she shared a selfie video of herself and Sean Preston having fun with a reindeer filter.