Aren't they growing up fast! Mariah Carey tweets new picture of her beautiful baby twins Monroe and Moroccan

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By Ann Pride

Bouncing bundles of joy: Mariah Carey tweeted this new picture of her nine month old twins Monroe and Moroccan yesterday

Beyonce and Jay-Z 's baby Blue Ivy Carter has some serious competition for the title of cutest celebrity offspring.

Shortly after the star couple presented the first photos of their daughter, Mariah Carey and Nick Cannon got in on the act yesterday, tweeting an awe inspiring photo of their twins, Monroe and Moroccan.

The photo shows the nine-month-old girl and boy wearing white jumpers, while posing on a bed.

Carey tweeted the picture of the smiling children with a link redirecting her followers to a website devoted solely to the babies.

It was accompanied by the message: 'New #DemBabies picture @, first one from 2012 :) LYM!!'

The charming twosome, who Mariah and Nick refer to as 'dem babies', were born on April 30, at a Los Angeles hospital.

Mariah has previously admitted that pregnancy was tough on her, saying: 'My body went through so much - you have to keep those twins in as long as possible, but it's a sacrifice you make for them.'

The singer is now a spokesman for the Jenny Craig weight loss programme and has dropped more than 30 pounds.

In December the 41-year-old singer débuted her first Jenny Craig commercial.

Now she is stepping behind the camera to direct the diet company's next commercial.

Mariah is also teaming up with Jenny Craig to support the American Heart Association's healthy living initiative.

Proud parents: Mariah and husband Nick Cannon showed off their son Moroccan on stage last month at the BET Honors ceremony in Washington, DC

Carey will produce a new public service announcement for the American Heart Association that débuts this month.

'I'm so honored to be a part of this,' she said recently. 'It's more than just about losing weight-it's about raising consciousness. I was very surprised to learn that every 34 seconds someone has a heart attack, but it doesn't have to be this way.

'By living just a little healthier, you can make a difference,' she added.

Making it happen: Mariah has dropped 30 pounds by using the Jenny Craig weight loss system