In the Caption section, Cavallari said everything started making sense once she became a mother to her three kids - daughter Saylor, 4, and sons Jaxon, 6, and Camden, 7. Wishing every mom a Happy Mother's Day, she noted that being the mother of her kids is the greatest gift.

This is the first holiday since Cavallari filed for divorce from her husband Jay Cutler. On the same day, Cutler shared a photo on Instagram with a caption that reads: "Happy Mother's Day to all the moms. These 3 little ones picked a good one."

As part of Cavallari's custody agreement with Cutler, the Very Cavallari star spent Mother's Day with her three kids, People reported Friday. According to the agreement, Mother’s Day and Father’s Day begins at 3:00 p.m. on Friday immediately before the holiday, or 3:00 p.m. If there is no school, until return to school the Monday immediately after the holiday or at 9:00 a.m. if there's no school.

The former couple announced they were parting way last month by posting a picture of themselves to their Instagram accounts. Last week, an unnamed source told People that they had reached a custody agreement. Cutler agreed to shell out funds for Cavallari to buy her own home.

Before getting into this agreement, Cavallari accused Cutler of stopping her from buying a new house with her own money unless she agreed to share joint custody of her kids with him. Both parties have now reportedly entered into a Permanent Parenting Plan that they claim is in the best interest of their children and urge the Court to approve and adopt the same as its Order.

The document, acquired by People suggests that Cavallari and Cutler have agreed to be named joint primary residential parents. This agreement allows each of them to spend 182.5 days with the kids every year, and alternating time on a week-on, week-off basis. The former couple with alternate Easter and Thanksgiving, as well as fall and spring breaks and split the Christmas holiday, as per the agreement.

While the kids are with the other parent, each parent will have the right to make two phone calls and two FaceTime / Skype calls every week. Cavallari celebrated their son Jaxon's by posting a sweet tribute to him on her Instagram account. "Happy 6th birthday my little man. Jaxy," she captioned the adorable picture. She shared two photos of her embracing her son.