Kourtney Kardashian and Scott Disick pen sweet messages for daughter Penelope on birthday

Kourtney Kardashian and Scott Disick marked their daughter Penelope's 11th birthday with celebrations and heartfelt messages on social media.

The preteen reached this new milestone on a Saturday, prompting both Kardashian, 44, and Disick, 40, to share endearing tributes, as well as some behind-the-scenes glimpses of her festivities.

“It’s my daughter’s birthday and time is flying way too fast. So grateful for every second with her.,” The Poosh founder wrote on Threads.

Accompanied by the heartwarming caption, a photo featuring a selection of vibrantly colored doughnuts iced with sprinkles in letters spelling out "Happy Birthday Penelope," and surrounded by purple streamers and party hats, was shared by the Kardashian star.

She also posted a montage of images on her Instagram Story that included herself, Penelope, her step-siblings Atiana De La Hoya (24), Alabama (17), and Landon Barker (19), as well as their father, Barker (47). The pictures showcased the group on a private jet and at the Kardashian's annual Christmas party.

Kardashian shared a final clip of Penelope's birthday celebration, featuring a close-up shot of her white cake adorned with roses.

Meanwhile, Disick, Penelope's father, shared a photo on Instagram showcasing giant pink balloons spelling out "Happy Birthday P," his affectionate nickname for her.

Additionally, he posted footage of Penelope and her friends enjoying a large water slide by a swimming pool in a garden. "Have fun my love! Happy bday!!!!!," Disick wrote, before adding, "Fun lil set up."