Credit: Eric Charbonneau/Le Studio/

Kendra Wilkinson's former Girls Next Door costars are thrilled with the new arrival of her son, Hank Randall Baskett IV, who was born at 12:37 a.m. Friday in Indianapolis.

They all took to their Twitter pages to send their well wishes.

"Well...its official. Kendras baby is born...little Hank is here! 9lbs 5oz...WOW! Congrats to Kendra and Hank!" Bridget Marquardt wrote.

Added Holly Madison, "Congrats!!! a 9 pounder!"

Hugh Hefner was equally excited.

"Congratulations to Kendra & Hank on the arrival of little Hank," he Twittered. "What a wonderful Christmas present."