Royally Yours (Wexstone Royals #1) by Jules Kyle:
 
A chance encounter sets one woman on the path to marrying a prince—but is he the one she really wants, or will she find herself falling for his best friend instead?

Birdie Hamilton’s life is a mess. She’s working a dead-end job, is about to be evicted from her apartment, and can’t seem to escape the looming holiday season, no matter how hard she tries. So when a chance encounter leads to her competing for the heart and hand of the Crown Prince of Wexstone, surely things are starting to look up. She just has to embrace the adventure, be herself, and definitely not fall for the prince’s grumpy best friend.

Knox Henderson has spent his life in the shadow of his best friend, Prince Oliver of Wexstone—not that he minds. Knox is happy to support him and ensure the future of the throne, even if it means endorsing the ridiculous competition to find Oliver a wife before his coronation. There’s just one problem: He can’t stop thinking about Birdie Hamilton, one of Oliver's suitors.

When physical sparks fly and emotional connections are forged, Birdie and Knox must confront their past traumas and embark on a journey of self-healing to embrace the love they both deserv