'Pregnant' Gwen Stefani hides her waist in loose jumpsuit at Nicole Richie's son Sparrow's birthday party

She has been the subject of ever increasing rumours that she is pregnant with her third child.
However Gwen Stefani has yet to officially confirm or deny the speculation.
And on Saturday in Los Angeles the No Doubt star kept fans guessing as she was spotted making a solo arrival at Nicole Richie and Joel Madden's son Sparrow's birthday party.

Monochrome beauty: Gwen Stefani looks stunning as always in a black and white printed jumpsuit as she arrives at Nicole Richie and Joel Madden's son Sparrow's birthday party in Hollywood

The 43-year-old looked as chic as ever in a black and white houndstooth print jumpsuit.
The singer who is known for her eclectic style looked stunning in the monochrome ensemble which she teamed with a pair of black slip on heels with an interesting buckle detail. 
Whilst the outfit showed off her slim and toned arms its loose design around the waist disguised any potential baby bump.
The beauty wore her white blond hair tied up in a bun in a side parting with a section of hair hanging down one side of her face.

Loose fitting: The star who is known for her washboard abs which she often flaunts kept her middle area covered by the loose outfit with the busy houndstooth design

As always Gwen was immaculately made-up and matched her lipstick with her hot pink cat eye sunglasses. 
Showing her attention to detail the star also sported a flawless manicure and pedicure in a bright cherry red. 
She also clutched a large white leather handbag that looked almost like a briefcase and perhaps contained a gift for the birthday boy Sparrow.
Gwen and British rock star husband Gavin Rossdale are already parents to Kingston, seven and Zuma, five, but the two boys were nowhere to be seen, perhaps spending some quality time with their father.

Keeping Mum: The star who is rumoured to be expecting her third child has yet to officially confirm the pregnancy

Rumours of Gwen's reported pregnancy are swirling across the media with sources having told E! News that the pregnancy was overheard being discussed by the couple's camp whilst they were holidaying in the South of France last month.
The singer has previously spoken of her desire to have a third child in an interview with Marie Claire in October 2012 saying, 'I really, really, really wanted one about two years ago. And it didn't really work out. So....I feel good with what we've got. Everything works out as it should. You can't plan anything right? You can try.'
Whilst Gwen didn't divulge further details about previous attempts to add to her family it is understandable that if she is indeed expecting she may not want to confirm it until later stages of the pregnancy.

Where are the boys? Kingston and Zuma were nowhere to be seen as the No Doubt star attended the birthday party on her own

A star-studded event! Kourtney Kardashian also attended little Sparrow's birthday party on Saturday in chic shades

Sheer beauty! The back of Gwen's top showed a little skin through the mesh as she made her way up into the party

Friends and family: Joel Madden (R) and Jessica Alba's husband Cash Warren showed up to see the little one turn another year older

Daddy Cool: Sparrow's rocker father Joel Madden wore a cool Batman t-shirt for the little one's celebration