Sarah Michelle Gellar Baby: Twitter Fans Welcome Baby Boy, Congratulate Hollywood's 'Cutest Couple'

While some fans didn't even know that former "Buffy the Vampire Slayer" star Sarah Michelle Gellar was even pregnant, the 35-year-old actress and hubby Freddie Prince Jr. happily announced the arrival of their new baby son this week. While name and birth details were not released (oh, Gellar and Freddie Prince, always being ever-so on the down-low) Gellar's publicist Leslie Sloane says that the little boy was born in Los Angeles and that "Mother and baby are doing great."

Gellar and Prince also have a daughter, 3-year-old Charlotte. The Hollywood couple celebrated their tenth anniversary this month. The duo met as young adults while filming the 1997 horror flick "I Know What You Did Last Summer." Gellar and Prince have long been considered one of Hollywood's cutest and happiest couples - the two manage to keep their private lives out of the limelight and gossip tabloids, making ample time for home and domestic life.

Check out some fans' congratulations on the couple's newest little addition!

‏@SexyPurkiss: "Aw! Congrats to the most Beautiful celebrity couple,Sarah Michelle Gellar & Freddie,for their baby Boy news!Little Charlotte must be proud!"

@selmanmumdzhu: "Sarah Michelle Gellar and Freddie Prinze Jr have a baby son! CONGRATS! I really like both of them. They're awesome!"

‏@tmcs28: "I can't believe that I missed it! After a century of being pregnant, Sarah Michelle Gellar finally had a baby boy!!! Congrats to Sarah!!!"

@TattooedHeart13: "So happy for Sarah Michelle Gellar and Freddie Prinze Jr on their new baby boy! <3"

@CashKayJ: "My girl Sarah Michelle Gellar had a baby..... i didn't even know she was preggers!!

@KJAndy: "♥ here's to a real marriage in Hollywood."

‏@danniellajordan: "Congrats to Freddie Prinze Jr. and Sarah Michelle Gellar having their 2nd baby! I was hoping you'd call him Shaggy or Scooby but oh well."

@_emshaw: "Congratulations to Sarah Michelle Gellar and Freddie Prinze Jr. on the arrival of their new baby boy." Cutest couple & still tg!"

@BeckyLouisexOxO: "OMG,OMG So Happy Right Now, A MASSIVE Congratulations To Sarah Michelle Gellar On Her New Baby Boy Always Will Be My Inspiration :') ♥♥."

@PaulHaydon: "Congrats to the Amazing and Underrated Sarah Michelle Gellar on the birth of her new baby boy. #NowGetBackToTV."