In the celebrity world, it's all about the brand endorsements that will keep your bank balance afloat and your reputation intact. Here are three recent celebrity beauty deals that are sure to turn you green with envy.

Katy Perry has signed a $4-million deal to be the face of an anti-acne cream.

The singer will promote Proactiv, a treatment for people suffering from pimples and other skin problems. The campaign will involved Katy discussing her own teenage battle with acne for a series of TV advertisements that will be shown in 58 countries.

The 25-year-old singer is thrilled with the deal, and claims she is not afraid to open up about her battle for clear skin.

"I got acne at the start of my career," she said. "It was stressful. I have acne scars which I'm self-conscious about."

Proactiv spokesman Ben van de Bunt confirmed Katy's pay cheque, saying: "We are paying people consistent with what we have done in the past — millions of dollars."

Singer Jessica Simpson and actress Jennifer Love Hewitt have previously fronted campaigns for the company.

Meanwhile, Kelly Osbourne's fiancé is the new face of a top UK store.

Luke Worrall has already shot the campaign for New Look’s Spring/Summer '10 range. Company executives decided to work with him as they feel he epitomizes the type of man who will buy the line.

"The ability to stand out and make a statement is something Luke has, making New Look menswear fresh, up-to-the-minute and very on trend," the firm explained in a statement.

The new range offers a variety of styles designed to fit into the modern man's wardrobe. Despite their continuing popularity, the typical skinny jean style is being phased out. Replacing it is a straight-legged version, available in a range of bright blue hues.

The collection is themed around smart casual styles, with many designs borrowing from '50's American influences. White t-shirts, rolled up jeans, chinos and casual cut-off denim shorts are all key looks.

"Colors are muted and simple. A sleek beige hooded jacket is a must-grab, along with the chino worn in a variety of ways spanning clean chic to a harder edged utilitarian feel. The collection also has elements of the flamboyant, with a red clashing knit cardigan and bold silk Hawaiian shirts," the statement read.

And lastly, George Clooney's girlfriend is starring in a new Roberto Cavalli underwear campaign.

Italian TV presenter Elisabetta Canalis was photographed by Mert & Marcus in London last November for the adverts.

They feature her lying on an ornate, red velvet sofa in a bra and panties made from black lace and an animal print fabric. Elisabetta is also wearing high heels and a black robe made of feathers.

"It was a great pleasure and huge privilege to work for Roberto and Eva Cavalli. The Cavalli brand has always been synonymous with the made in Italy excellence and known all over the world," she said in a statement.

In the picture, Elisabetta is framed by antique rugs and pictures, in an effort to channel old-school boudoir.

Roberto has explained his new lingerie line is for "real women" with curves, which is why he decided to work with Elisabetta.

"I was inspired by a real woman, with appeal, charisma, and sensuality. Elisabetta Canalis and I have been friends for a while now, we have already worked together in the past and so I was sure she was just perfect for enhancing the spirit of this advertising campaign and I was not wrong!

Her Mediterranean beauty and intense appeal interpret an intriguing super-feminine woman — the result is amazing," he said.