ForJessica Simpson, her daughterBirdie Mae‘s birth on March 19 turned into “a bit of a party” at the hospital — thanks to her fun-loving extended family!

In an exclusive conversation surrounding therelaunch of her website, the singer, actress and entrepreneur tells PEOPLE that on the day of Birdie’s arrival, there was a “beautiful” mood among herself, husbandEric Johnson, their two older children (5½-year-old sonAce Knuteand daughterMaxwell “Maxi” Drew, 7) and family members like sisterAshlee Simpson Rossand her husbandEvan Ross, plus Simpson’smom Tina and dad Joe.

“Eric and I had both of our families and some of our best friends there to welcome her, it was very special,” says Simpson, 38. “When my doctor went back to the waiting room to deliver thenews that Birdie had arrived healthy, they apparently cheered so loud you could hear it all the way to the next unit of the hospital.”

“Maxwell and Ace were definitely the most excited. They were asking every 2 minutes if she had been born yet and could theypleasejust go to meet her,” she continues, adding of her loved ones’ estimates onBirdie’s weight (which ended up being10 lbs., 13 oz.!), “Every single one of them guessed over 10 lbs.! Eric’s dad was the winner.”

Kristin Burns Photography

Jessica Simpson baby

Ace, Birdie and Maxwell Johnson.Kristin Burns Photography

Jessica Simpson baby

Jessica Simpson baby

“They were incredibly gentle with her and just wanted to hold her and kiss her,” she says. “They had made her welcome signs and chosen their own gifts for her that they brought in when they met her for the first time. Tosee them love her instantlytruly melted my heart.”

That love doesn’t seem hard to give, considering the fact that the newborn has the “cutest dimples” — even though the sweetness also comes with “a powerful set of lungs,” her mom admits.

RELATED VIDEO: “Hot Dad Alert!”Jessica SimpsonShares Snap of Husband Eric Johnson Holding Daughter Birdie

Simpson says she’s “proud” of her website relaunch, which her team has been working on for more than a year now up until she felt it was “just right” to introduce.

“I am so excited to be launchingJessicaSimpson.com. We have our amazing product as well as exclusives that you cannot get anywhere else,” she says. “I am also sharing inside looks of my family, my career and my everyday life.”

“My mom, Eric’s mom and my sister Ashlee will come over and we will just have a nice meal and try to reflect and bethankful for all we have been given,” Simpson shares, joking in addition, “Oh, Lord … I am a mother of three! I better get three Mother’s Day gifts.”

source: people.com