The 27-year-old, who shot to fame with his role as Jasper Hale in the Twilight series, me dancer Hafsadi during a tour stop with his music band 100 Monkeys, reported Us magazine.
"Thanks to everyone for the love and support! Sheila and I are so excited to welcome our baby boy into the world. Love and respect, always!," said the proud father.
Rathbone was relying on his own father for parenting advice.
"I have one of the greatest dads in the world. He's just been giving me amazing advice," he had said.