By Sameer Suri For Dailymail.com
Published: 17:04 GMT, 2 March 2019 | Updated: 17:04 GMT, 2 March 2019
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She is in previews for the London run of the Broadway musical Waitress.
But Katharine McPhee still managed to scrape together a bit of downtime on Saturday, dancing in her underwear in her dressing room.
The 34-year-old posted her backstage routine to her Insta Stories and teased her 69-year-old music mogul fiance David Foster in the caption.
'Feeling spicy': Amid previews for the London run of Waitress, Katharine McPhee managed to scrape together a bit of downtime Saturday, dancing in her underwear in her dressing room
She vamped: '@davidfoster won't like this,' adding that she was 'Feeling spicy today!' and was heading into a '2 show day let's do this'.
Katharine, whose future stepdaughters Erin and Sara Foster are older than she is, stepped into the Broadway production of Waitress for a limited run last year.
Waitress opened on Broadway in 2016 with Jessie Mueller in the lead role of Jenna Hunterson - the part Katharine played from April to June last year.
Waitress was adapted from Adrienne Shelley's
