Rachel Bilson and Hayden Christensen expecting first baby

is going to be a mummy. The

actress and her longterm boyfriend

are

together.

Rachel Bilson and boyfriend Hayden Christensen are expecting their first child together

"

," a source confirmed to

. "Everyone is beyond thrilled for them."Rachel, 32, has been ready to start a family for some time.

Rachel Bilson is said to be over the moon about the pregnancy

"I definitely have family on the brain," she said in an interview with

in May 2013. "Having kids is something I want to see in my future — I hope."Rachel and

actor Hayden, 33,

, and got engaged a year later.

Rachel and Christian first met on the set of Jumper in 2007

They decided to

, but

.