Katharine McPhee nails winter chic in sensational silver knit dress as she steps out with handsome boyfriend Elyes Gabel to star-studded Hollywood soirée

They met on the set of US drama series Scorpion and have since been inseparable. 

And Katharine McPhee and Elyes Gabel were yet again joined at the hip as they stepped out at a star-studded private party in West Hollywood on Saturday. 

The 31-year-old actress looked sensational in a stunning silver, marl-knit, midi-dress with pointed black boots and a camel coat while accompanying her handsome boyfriend, 32.

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Silver sensation: Katharine McPhee and Elyes Gabel were yet again joined at the hip as they stepped out at a star-studded private party in West Hollywood on Saturday

Katharine showed off her sensational figure in the stylish dress which skimmed her body without being overly tight. 

She added a winter touch to the ensemble with her camel-coloured coat which she wore into the party yet simply draped over her shoulders as she left.

Adding height to her slender frame, while also offering a glimpse of her slim legs, she wore a pair of pointed, high-heeled boots.

Inseparable: The 31-year-old actress looked sensational in a stunning silver, marl-knit, midi-dress with pointed black boots and a camel coat while accompanying her handsome boyfriend, 32

Winter wonderland: She added a winter touch to the ensemble with her camel-coloured coat which she wore wearing into the party yet simply draped over her shoulders as she left

She toted a white leather handbag with a double flap however she opted to wear no other accessories with the laid back look.

The American Idol singer wore her ombre locks in a centre-parting with the ends coiffed into a stunning blowdry.

She kept her make-up simple with a touch of bronze eye-shadow and a dab of pink lipstick while her skin looked pristine and flawless. 

Handsome: British star Elyes went for an array of colours as he sported interesting and bright blue trousers with a black shirt over the top

British star Elyes went for an array of colours as he sported interesting bright blue trousers with a black shirt over the top.  

The actor, who played Dothraki horserider Rakharo in the first and second series of Game Of Thrones, topped off the look with a plum coloured jacket.

The London-born star topped off the look with an edgy pair of pointed suede boots. 

Feeling festive: The Scorpion costars appeared to be having fun at the holiday party

Chatting: The couple lingered outside after they ducked out for some fresh air

Drink up: Katharine wore a beige long coat and carried a black handbag

Later, the couple escaped the party for some quick quiet time as they ducked outside the bash for a few moments.

Katharine performed a duet with John Legend at the Frank Sinatra 100th birthday concert, which will air on CBS on Sunday.

The singer flashed a big smile as she held her beverage and chatted with her British beau when they ducked out for some fresh air.

The pair appeared lost in conversation as they lingered outside the venue. 

Chic: The former American Idol runner-up wore a tight grey dress and long camel coat

Show of support: Tyra Banks looked lovely in leather as she arrived with her smiling boyfriend Erik Asla

Katharine and Elyes were joined by a host of famous faces at the bash, including former Pussycat Dolls singer Nicole Scherzinger.

The stunning singer looked incredible in a pair of high-waisted silk trousers and a crop top, adding a fashionable flair to the look with a burgundy fedora.

Supermodel Tyra Banks was also in attendance, as well as A-list actress Amy Adams and her husband Darren Le Gallo. 

Stylish touches: The former Pussycat Dolls singer Nicole Sherzinger matched the burgundy panel on her shoes to her fedora and her dark lipstick 

Complicated love life: Katharine filed for divorce last May from her husband Nick Cokas, who she was married to for seven years - one of which they spent separated

Katharine filed for divorce last May from her husband Nick Cokas, who she was married to for seven years - one of which they spent separated. 

The couple split in the wake of her being seen kissing her Smash director Michael Morris.

He in turn was at the time married to actress Mary McCormack, and the couple had three young daughters.

While Morris managed to reconcile his 10 year marriage after he was kicked out of the family home, Katherine and Nick, 49, called it a day.

The couple had been together for six years. But they remain friends and he is still involved in her music career.