Expecting Royal Twins!

Description for EXPECTING ROYAL TWINS! by Melissa McClone:

It's not every day that a tall, dark, handsome prince strides into your workshop and announces he's your husband! Mechanic Izzy nearly drops her wrench. Never in her wildest dreams did she imagine that she'd become a princess!

Independent Izzy struggles with exchanging her oil-stained overalls for silken gowns, let alone becoming responsible for an entire country! Yet her attraction to Prince Niko tempts her further into the fairy tale. And then two small surprises change all the rules of the game....

Harlequin Romance #4223, February, 2011.