Katharine McPhee flashes her thighs in a mini-dress as she heads to the airport without David Foster

By Bobbie Whiteman For Dailymail.com

Published: 18:49 GMT, 20 November 2017 | Updated: 21:40 GMT, 20 November 2017

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She's been the constant companion of music producer David Foster for the past few months.

But there was no sign of Katharine McPhee's reported beau when she arrived at Los Angeles Airport on Sunday solo.

The 33-year-old rocked a low-cut little black mini-dress that she wore under a long black overcoat.

Solo trip: Katharine McPhee arrived at Los Angeles Airport on Sunday without her reported beau David Foster

Katharine teamed her stylish look with red leather knee-high boots, flashing her shapely thighs.

Her casually styled blonde tresses brushed her shoulders and framed her face, which appeared to be make-up free with just some dark red lipstick.

The Scorpion actress completed her ensemble with a little black purse that she wore across her body, a larger one she carried and, of course, celebrity must-have dark glasses.

Katharine and David, 68, have been sparking romance rumors since late summer thanks to multiple dates.

These boots are made for flying: The 33-year-old rocked a low-cut little black mini-dress that she wore under a black overcoat plus red leather knee-high boots, flashing her shapely thighs

On Wednesday night the pair went to the launch of Bumble Bizz together in Malibu hotspot Nobu.

They first met in 2006 when he mentored her during her bid to win American Idol.

She came in second but they maintained a close bond, returning to perform together on the show two years later.

So close: She has been the constant companion of music producer David Foster, 68, for the past few months, here seen at the launch of Bumble Bizz in Malibu hotspot Nobu Wednesday

And that friendship appears to have blossomed into something more. But Katharine has to fit her new beau into her busy career.

She's co-starred in CBS's Scorpion as Paige Dineen, one of an international network of super-geniuses, since 2014. And she took to Instagram on Monday to remind viewers to watch her show.

Katharine will next be seen on the big screen in Intensive Care with Mira Sorvino, due out next July.

She is also co-starring in Louisiana Caviar, Cuba Gooding Jr.'s debut as a director.

He also wrote the script and stars in the story about a feared Russian-Israeli oligarch who is banished from the U.S. setting into motion a spiraling chain of events.

The movie has yet to set a date for release.

Promo trail: She's co-starred in CBS's Scorpion as Paige, one of a network of super-geniuses, since 2014. And she took to Instagram on Monday to remind viewers to watch her show