![Baby on board: Rachel Bilson displayed her baby bump as she enjoyed a dip in the ocean on a romantic Barbados vacation with boyfriend Hayden Christensen](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23DE5B00000578-955_634x985.jpg)
![Glowing: The mother to be showed off her trim figure, with just a hint of baby bump, in a black bikini](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23D7B100000578-266_306x719.jpg)
![Glowing: The mother to be showed off her trim figure, with just a hint of baby bump, in a black bikini](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23D84500000578-562_306x719.jpg)
![Excited: The expectant parents cuddled up together in the water where their excitement over the latest addition to their family was evident](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23E18800000578-117_634x477.jpg)
![Relaxing: The brunette beauty enjoyed some time out before returning to her hectic filming schedule on CW show Hart Of Dixie](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23E16E00000578-550_306x680.jpg)
![First time parents: This will be the first baby for both Rachel and Hayden who have been together on and off since 2007](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23DF8F00000578-47_634x501.jpg)
![Excited: Rachel previously revealed she wanted to start a family in the next few years but it appears as if things have happened sooner than she planned](http://i.dailymail.co.uk/i/pix/2014/05/23/article-2637451-1E23E13400000578-313_634x751.jpg)
Expectant actress Rachel Bilson and her boyfriend Hayden Christensen were seen vacationing in the Barbados.
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