Lisa Rinna and Harry Hamlin’s daughter Amelia Gray and her boyfriend Nicolai Marciano, the heir to Guess Inc, made their red carpet debut at the GQ Men of the Year party Nov. 13.

Amelia Hamlin and Nicolai Marciano’s relationship blossomed only recently. “It's pretty recent in the last month,” a source exclusively tells Us Weekly. “They run in the same fashion circles. It's new ...