David Foster's Daughters Snark At Katharine McPhee After Engagement?

David Foster and Katharine McPhee confirmed their engagement news on Tuesday.

But are his daughters happy about the May/December match of the 68-year-old composer and Scorpion star, 34?

Foster's Erin, who is just a year older than McPhee, commented, "Mommmyyy" along with three red heart emojis.

Her sister, Sara, jokingly wrote, "Out of the country. What did I miss?"

Former American Idol runner up McPhee, who was mentored on the reality show by Foster way back in 2006, is now marrying him despite a more than 30-year age difference.

McPhee, an actress as well as a singer, posted a photo on Instagram with model friend Mayra Suarez on a yacht with her new left-hand engagement ring sparkling in the sun.

She and Foster got engaged while on a romantic trip in Capri, Italy, as the famous composer confirmed on his Instagram with the caption, "Yup!"

McPhee shared on Instagram about Foster's proposal, "He did it at the top of this mountain in Anacapri. Totally dark, only stars."

It will be the fifth marriage for Foster, and the second for McPhee, who divorced actor Nik Cokas in 2016.

The Foster daughters apparently had a tense relationship with their dad's previous wife, c Yolanda Foster.

As RadarOnline.com reported, they accused her of faking Lyme disease for reality show ratings!

Sara told an interviewer about Yolanda's drama at the time, "Only she knows her journey, but I will say is if you're capable of continuing to be on a reality show, you're not dying."