The new arrival, a little sister to the couple’s three-year-old son Milo, weighed in at 7lbs, 7oz and measured 19.5 inches long, Alyssa’s rep confirmed to People.
"Mommy and baby are doing wonderfully," the spokesperson added.
Alyssa, 41, announced the news of her second pregnancy in March, and confirmed in May that she was expecting a little girl – which was not a surprise to the star.
“With Milo, I didn’t have a minute of morning sickness. So I knew it was going to be a girl,” she told Fit Pregnancy.
Alyssa has received a lot of support from fellow mums for speaking out against the pressure put on women to instantly shed their baby weight.
“A female body is not made to look good in a bikini. It’s made to give birth and have a baby and be a cozy companion for it afterwards,” she has said.