'Twilight' star Jackson Rathbone has welcomed his first son.

The actor and his girlfriend Sheila Hafsadi saw the birth of their first child, a boy named Monroe Jackson Rathbone VI, on Thursday (05.07.12).

His representative told website People.com that the baby was born at 9:43 am and weighed eight lbs, 11 oz.

The 27-year-old film star and Sheila announced the pregnancy in February.

The 'Aim High' actor then shared the sex of the baby in March.

He said: ''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!''

Burlesque dancer, Sheila, met the actor when he was touring with his band 100 Monkeys.

Jackson - who is best known for playing Jasper Hale in the vampire movie series - is said to have traded in two of his cars for a more family-friendly Lexus Hybrid SUV in preparation for the new arrival.

The actor recently admitted he would love to reprise his role of Jasper for even more 'Twilight Saga' films in the future.

He said: ''They are always discussing it, it depends how they would go about it. I have loved my character and I have loved playing Jasper through the years, so if there is an extension of playing Jasper - more so in his own element, maybe go back in time and do a vampire western, show Jasper where he came from - I would be down for that. I would sign up for that.''