Jennifer Hudson and Chaka Khan to perform a tribute to late singer Whitney Houston at Grammys tonight

Jennifer Hudson and Chaka Khan will pay tribute to tragic singer Whitney Houston tonight.
The American Idol star and I'm Every Woman legend will take to the stage at the Grammy Awards, just over 24 hours after Whitney passed away in her Beverly Hills Hilton hotel - aged just 48.
Chaka tweeted: 'I’m speechless…I’m in shock right now. Just pray for her and the family,' while Jennifer - who sang at Clive Davis' annual pre-Grammy gala last night - has so far remained silent.

Tribute: Jennifer Hudson will have spent today rehearsing as she is believed to be performing a Whitney Houston song at the Grammy's tonight

Treasured memory: Jennifer and Whitney shared the stage at the 51st annual Grammys

Yesterday, the stars were out in force for a another pre-Grammy luncheon, with Christina Milian stealing the show from Rihanna and Katy Perry at the Soho House event in West Hollywood.

The 30-year-old singer stepped out on the red-carpet wearing an eye-popping, very low-cut and cleavage-enhancing strapless dress.

Legend: Ten-time Grammy-winning star Chaka Khan is said to be performing tonight

The pop star poured her curves into the eye-popping tight-fitting attire, which featured green and grey graphic design.
She paired the look with some silver shoes and a grey Hermes Birkin bag.

Eye-popping: Christina Milian turned heads at Roc Nation's pre-Grammys luncheon at Soho House yesterday

Different looks: Best friends Rihanna and Katy Perry both wore very different looks for the star-studded event

Rihanna, however didn't disappoint with her also strapless attire.
The newly blonde pop star looked long and lean in a printed corset top and matching billowing trouser.
She kept it simple with her accessories opting for some demure gold jewels.

Stunning: With her platinum blonde locks in a natural curl and lashings of dark red lipstick, Rihanna looked nothing short of flawless

Long and lean: The newly blonde pop star looked long and lean in a printed corset top and matching trousers

She wore her platinum blonde locks out in a curly waves and had lashings of dark red lipstick on her lips.
Meanwhile Katy Perry dazzled in bold brights, slipping her curves into a dress, which featured a turquoise skirt that nearly matched her blue bob and neon pink top.
Keeping with her usual quirky theme, she put on a pair of piano themed stilettos.

Colourful: Meanwhile Katy Perry dazzled in bold brights, slipping her curves into a dress, which featured a turquoise skirt that nearly matched her blue bob and neon pink top

Matching: Even Katy's make-up matched her brightly coloured attire

The newly single star did not pose with her close friend Rhianna, however inside the party Rihanna cosied up to Milian for some happy snaps.
Also in attendance at the star-studded lunch was Grey's Anatomy star Ellen Pompeo and her husband Chris Ivery.
The 42-year-old actress showed off the results of her frequent work-outs in a pair of tight leather trousers.

Hugs: Rhianna cosied up to Christina for a picture as they had lunch inside the members only establishment

Boost: Christina's eye-popping tight-fitting attire featured green and grey graphic design

She also went daring with her top half, slipping on a black T-shirt, which exposed her bra worn underneath a denim jacket.
Destiny's Child star Michelle Williams looked like a lady who lunches in a sophisticated black shift dress complete with cap sleeves which she paired with a pearl necklace and some monochrome Sixties-style platform shoes.
She posed with fellow Destiny's Chilld band mate Kelly Rowland, who went decidedly low-key in a pair of skinny jeans and a olive silk blouse.

Reunited: Destiny's child band mates Kelly Rowland and Michelle Williams posed arm-in-arm

Kelly looked gorgeous with her hair out in a natural curl and accessorised with an animal print handbag and some large gold earrings.
Other guests who attended the luncheon included rapper Neyo, singer Snow and Record Producer and X Factor USA judge L.A. Reid.
The Grammys take place tomorrow night and will now be a somewhat sombre affair following the untimely death of music icon Whitney Houston today.

Hell for leather: Also in attendance at the star-studded lunch was Grey's Anatomy star Ellen Pompeo, who wore leather trousers, and her husband Chris Ivery

Ladies who lunch: Johnny Ramone's wife Linda and singer Snow also attended the event