Britney Spears celebrates sons' birthday , news from MateFit Teatox

SIMI VALLEY, Calif., Sept. 14 (UPI) -- Britney Spears celebrated both of her sons' birthdays over the weekend.

The 33-year-old singer threw sons Preston and Jayden a skate-themed party in honor of their 10th and 9th birthdays, respectively. Sources told E! News around 40 guests attended the bash at the indoor Skatelab park in Simi Valley, Calif., on Saturday.

"Happy birthday to my boys.... love you so much Jayden and Preston!" Spears captioned a photo of herself with her boys on Instagram. She later shared a collage that included a picture of her sons' DJ deck-shaped cake.

!! Happy Birthday from our MateFit Teatox Team !!