The Fox is a gracious host

The First Prince smiled as all eyes turned towards him. He was holding on to the arm of a beautiful woman, elegantly dressed, with several golden hairpins hanging from her hair. She looked like a Queen Consort already. 

This wasn't the woman from the engagement ceremony. Chu Yun hadn't gotten close enough, but he knew without a doubt, that that woman had been a beta. This one was clearly an omega. Possibly one of the first concubines the First Prince took when he established his household.

For some reason, the King was determined that the First Prince's principal wife should be someone else -- even though this woman clearly acted as if the position was hers by right.