Erin Foster was in on the joke on Instagram.
The 'American Idol' alum is currently traveling with her fiance in British Columbia.
The 'Scorpion' star also shared some wisdom from her fiance, David Foster.
The 'American Idol' alum isn't looking for your opinions on her engagement.
The couple got engaged this week during a vacation in Anacarpi, Italy.
The comedy writer ribbed her dad over his engagement to the much younger actress, who will be his fifth wife.
ET can confirm David Foster popped the question while the couple was vacationing in Europe.
ET can confirm Foster popped the question while the couple was vacationing in Europe.
David Foster is completely dedicated to his new fiancee, Katharine McPhee, a source tells ET.
Plus, details about the 34-year-old actress' engagement ring were revealed in the screenshot she posted via Instagram on Tuesday.
A rep for the 68-year-old musician confirmed the exciting news to ET on Tuesday.
After some speculation about their relationship status, the pair walked the Met Gala red carpet hand-in-hand, and opened up to ET about their epic date night!
The 'Waitress' star rocked a George Chakra gown as she hit the carpet on fashion's biggest night with her Canadian musician beau.
ET sat down with the mega-music producer at his home in Los Angeles. His first tour in eight years, 'An Intimate Evening With David Foster: The Hitman Tour,' kicks off on March 27.
