Something Borrowed/Something Blue

Rachel has always been a good girl--until her 30th birthday, when her best friend Darcy throws her a party. That night, after too many drinks, Rachel ends up in bed with Darcy's fiancé Dex. Rachel is horrified to discover that she has genuine feelings for Dex. She prays for fate to intervene, but when she makes a choice she discovers that the lines between right and wrong are blurry, endings aren't always neat, and you have to risk all to win true happiness.

Darcy Rhone thought she had it all figured out: the more beautiful the girl, the more charmed her life. Never mind substance. Never mind playing by the rules. Never mind karma. But Darcy's neat, perfect world turns upside down when her best friend, Rachel, the plain-Jane "good girl," steals her fiancé, while Darcy finds herself completely alone for the first time in her life…with a baby on the way.