05/09/2012 08:39 am ET

Jessica Simpson On Baby Maxwell: Motherhood Is The 'Best Thing I've Ever Experienced'

As new mom Jessica Simpson gets ready to celebrate her first Mother's Day on Sunday, she's speaking out about her darling daughter for the first time since giving birth.

Simpson took to Twitter to gush about baby Maxwell Drew, whom she and fiance Eric Johnson welcomed May 1.

That's all that we've heard from the new mama, aside from her "Fashion Star" tweets, but we're guessing she has her hands full with a newborn at home.

Simpson's dad, Joe, also shared his baby joy over Twitter last week, writing about his granddaughter, "Proud PaPaJoe !! Beautiful baby girl... What a miracle!"

Meanwhile, aunt Ashlee Simpson spoke to People about her niece shortly after her birth.

"Bronx and I are in love with Maxwell already!" she said, adding that being a mom was something her sister had always wanted.

But Ashlee isn't the only new aunt in Hollywood. Jack Osbourne and his fiancee, Lisa Stelly, welcomed their first daughter, Pearl Clementine, on April 24 -- giving aunt Kelly Osbourne some ideas.

"I’ve got baby fever after I saw [her],” she told Anderson Cooper on "Anderson" this week, adding, “I’d be the best mum ever. I would. I’ve got great training from my mum.”

Check out other stars who will be welcoming babies this year, below:

Celebrity Babies On The Way