Vanessa Minnillo for P&G's Take A Load Off

The 31-year-old attended an event in Los Angeles in support of P&G’s Take A Load Off campaign.

The venture encourages people to switch to cold water as they do their laundry this Earth Day.

The star, who is married to Nick Lachey, certainly didn’t appear to be dressed suitably to get stuck into washing clothes.

She covered up her bump in a pretty black and white patterned flowing dress, adding a colour pop in the form of a boxy cobalt blue blazer.

Vanessa also wore black peep toe heels and a beaded monochrome necklace, and had her brunette locks perfectly coiffed into soft curls.

The former Miss Teen USA got to grips with a bottle of detergent as she pretended to do her laundry.

She then pulled a green T-shirt out of a dryer and held it up for all to see the environmental message splashed across it.

The top was emblazoned with the words: ‘See the big in the little things you do’.

Vanessa is certainly an advocate for environmentally friendly living and just three days earlier she was spotted bringing her own reusable bags to do some Easter food shopping at the grocery store.

Makeup Free Vanessa Minnillo

She looked stunning on the red carpet as she stepped out to attend a party earlier in the evening, but Vanessa Minnillo has proved she is also a bare-faced beauty too, after posting a snap of her make-up free to her Twitter account. 

The pregnant star, 31, posted the pic of herself minus any beauty products to the social networking site over the weekend. 

 After attending a star studded nightclub opening, mother-to-be Vanessa was happy to be snacking in bed 

'Had sooo much fun at The Star Sydney for the opening of Marquee Sydney!!! Now it's time for booty in bed!' she tweeted, referring to the Pirate's Booty snack in her hand.

Vanessa's appearance was a far cry from her glammed-up look earlier IN the evening at the star-filled bash in Sydney, Australia with husband Nick Lachay.

Making their first red carpet appearance since announcing they are expecting their first child, Jessica Simpson's ex looked dapper in a dark pin-striped suit and black shirt. 

Vanessa meanwhile teamed her burgeoning baby bump with a floaty white chiffon mini-dress, which drew attention to her fabulous legs.

 

The couple have been busy visiting many of Sydney’s sights including a the zoo and Coogee Beach.

But the TV personality also managed to squeeze in a spot of pampering – indulging in a special massage for mothers-to-be. 

She tweeted: ‘Had my first prenatal massage at @TheStarSydney. Note for Dad's-to-be, this is an amazing gift for mama! She'll be grateful!’

Nick broke the couple's happy news earlier this month on Live With Kelly.

He said: 'We're having a baby! I've had the chance to do a lot of great things in my career and my life, but this is the one thing that more than any other I've looked forward to.  

Both his current wife and his ex Jessica Simpson are pregnant with their first children.