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Reign Aston Disick, Kourtney Kardashian

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Kourtney Kardashian has revealed the name of her and longtime partner Scott Disick's new baby son—Reign Aston Disick, and shared a sweet first pic!

The photo, posted on the reality star's Instagram page on Sunday, shows the proud parents' newborn's itty bitty hand.

"Madly in love with my little Reign Aston Disick," she said.

Kourtney gave birth to the baby, her and Scott's third child, exactly one week ago, on Dec. 14. That day was also the fifth birthday of their eldest child, son Mason. Kourtney and Scott, whose nickname is Lord Disick, are also parents to daughter Penelope, 2.

Sisters Kim Kardashian and Khloé Kardashian had thrown Kourtney a swanky Breakfast at Tiffany's-themed baby shower in November. She also celebrated her upcoming arrival at an early-Sunday-morning trip to IHOP with her best pals.

Kourtney Kardashian, Scott Disick

Courtesy: Jet Nightclub / Denise Truscello/Getty Images

Kourtney's recent pregnancy was documented on the family's E! reality show, Kourtney and Khloé Take the Hamptons, a spinoff of flagship series Keeping Up With the Kardashians, where she was shown telling Scott that she is pregnant. An episode of the former show showed her revealing their baby's gender.

"Mason ran in here with the blue stick," she said.

While mom and dad rested up after baby Reign's birth, Kim took Mason, Penelope, her daughter North West and a friend to see Disney on Ice for the boy's birthday.

During her pregnancy, Kourtney craved bagels! She told E! News in October that she "had them literally for dinner every night."

"A bagel with cream cheese and jelly," she said, adding, "I would have plain ones just in my bag at all times. Khloé would be like, 'What's in your purse?' I'd have two bagels at all times."

Also while pregnant, Kourtney posed nude for DuJour magazine, showing off her bare baby bump.

"I really feel so comfortable, and almost at my best, when I'm pregnant," she told the outlet. "I don't know, I just feel just like it's such an amazing feeling, the transformation that your body goes through and knowing that this is what my body is made to do, there's something about that that's so empowering and beautiful and I just really embrace it."

Tune in to a brand new episode of Kourtney & Khloé Take The Hamptons this Sunday at 9/8c on E!