After living in an all-male world consisting of her football-playing hubby and their two adorable sons, Kristin Cavallari finally has a daughter to pass her high heels down to one day!

The "Laguna Beach" and "Hills" alum and her better half Jay Cutler welcomed a bouncing baby girl, she excitedly announced on Instagram.

"Saylor James Cutler was born today at 132pm!!" she captioned the sweet snapshot above, showcasing a stylish ensemble for her very own mini-me.

The name Saylor actually comes from an interesting source: “We picked out this baby girl’s name when I was pregnant with our first,” Kristin told Cricket’s Circle in September. “I met a woman and her dog, and I loved her dog’s name. Funny enough, it was the name she had picked out if she had a girl, but she had boys, so she used it for her dog instead. It's not that strange because people name their dog George and Harry now."

The fashion designer had first announced the news of her pregnancy with a super-cute photo of herself and her sons Camden and Jaxon, below, back in May.

Following that announcement, Kristin revealed the baby's gender to fans in July by posting a tell-tale snap, below, to her app and Instagram account.

“I'm already getting the nursery ready!” the former Queen Bee later told "ET." “I didn't think I would be a big ‘pink’ girl, but everything is pink. There's a chandelier. I'm getting all the pink and purple clothes.”

And as her bump started to evolve, the soon-to-be author of "Balancing in Heels" got dolled up and captured her pregnancy glow while it lasted, writing with the below photo, "Gonna try and really enjoy these last few weeks dressing the bump since I always miss it when it's gone."

In the days leading up to the big arrival, she posted yet another pic of her burgeoning belly, writing, "Even my preggers shirt is too small" and hashtagging it #ReadyWheneverYouAreBaby."

Then, just last month, the former MTV star took a moment to reflect on her growing brood. "These little guys have made me who I am today," she wrote, and now she's added Saylor to her life -- making it that much sweeter.

Congratulations to Kristin, Jay and their family! To leave your own baby love and well wishes for entire clan, head to the comments section below.