Tatiana Santo Domingo returns to work after the birth of baby Sacha

has returned to work a month after the birth of her son,

. A photo of new-mum

was posted on Instgram by the ethical clothing company,

, she co-owns with

."Happy Friday from #muzungusisters," wrote the women from their London showroom. "Make it a good one #happyfriday #officelife #TGIF #noemailuntilmonday"In the image

, who is engaged to Monegasque royal

, is wearing Muzungu Sisters' Aicha jacket accesorised with a bag from the company's collaboration with French designer Delphine Delafon.

Dana is seen sporting the label's Sergeant Pepper jacket and colourful Jaipur beads.Fashionista

, 29, welcomed baby

on 21 March at London's Portland Hospital. "Her Serene Highness

has the pleasure of announcing the birth of her grandson," read the official statement confirming the happy news. "Both mother and baby are doing well," the missive added. The birth prompted

's blue-blooded family to fly from Monaco, eager to meet the newest addition to the Grimaldi family.

is

and

's first child. The couple, who have been together for eight years, are soon expected to announce their wedding date.