Katharine McPhee Shows Off Her Engagement Ring While Walking Dog

Katharine McPhee hit the headlines recently with her surprise engagement to much older mentor, composer David Foster. But this weekend, the singer/actress was spotted walking her pet Chihuahua on her own. She has returned to Broadway in the musical Waitress after Foster proposed—and sadly, her father passed away. Scroll down RadarOnline.com's gallery for more on McPhee and the enormous rock on her finger!

The star, 34, wore a vibrant blue coat over tight black leggings and top with a red cross body purse over her outfit. But what stuck out the most was the big diamond ring Foster, 68, had given her.

McPhee had previously flaunted herself wearing her huge diamond engagement ring from Foster on Instagram. But it was also a poignant post after the death of her father Daniel. The Scorpion star wrote as a caption, "My dad was so happy for me. My ring was the last thing I showed my dad before he passed and makes me smile when I look at this as a reminder of our last conversation."

Foster is old enough to be McPhee's father, which caused shock amongst their fans when they learned of the engagement. McPhee and Foster, who was previously married four times, including to former The Real Housewives of Beverly Hills star Yolanda Foster, confirmed their engagement news on Tuesday, July 3.

McPhee took a Broadway leave of absence to spend time with her father before his death and now has returned to her musical play in the role of inventive pie baker Jenna. Sadly, dad Daniel won't be able to walk her down the aisle when she marries "I Have Nothing" co-writer Foster.