Gwen Stefani's former nanny is a new mum

The nanny who reportedly had a fling with rocker Gavin Rossdale before the end of his marriage is a new mum.

Mindy Mann has given birth to her first child, according to her sister Nicole, who made the big announcement via Instagram on Friday (09Sep16).

She posted a photo of the newborn's hand and added the caption: "September 8th 2016... the day I felt a love I've never felt before, watching life come into the world. #auntylove."

Nicole also broke the pregnancy news via Instagram in March (16) alongside a sweet photo of her sister cradling her baby bump while holding an 'It's a boy!' balloon.

Reports suggest the father is Mindy's boyfriend Spencer Gutcheon.

Neither the new mum nor Rossdale have spoken about rumours suggesting they had an affair.

Gavin and his wife of 13 years, Gwen Stefani, split up last summer (Aug15) and have since divorced. Both stars have moved on - Stefani is dating country star Blake Shelton after meeting and falling in love with the Honey Bee singer on the set of U.S. talent show The Voice when both were judges last year, and Bush frontman Rossdale is reportedly dating Tiger Woods' ex-wife Elin Nordegren.

Stefani has also been silent about reports her ex romanced their nanny, who was hired by the stars to help care for their three sons, Kingston, Zuma, and Apollo, but the No Doubt singer insists she'll reveal all one day.

During a radio interview with KIIS FM's JoJo Wright in November (15), she said, "Everybody knows that my life blew up last February. I'd just been dealing with that. Unexpected. I was going along thinking that was going to be the rest of my life and it's not. I don't know what happened."

And, in a candid interview with the New York Times, which was published the day after news broke her former nanny was pregnant, the Don't Speak hitmaker shared a few more details about how her life fell apart the morning after the 2015 Grammy Awards.

"My life was literally blown up into my face," she exclaimed.

She declined to share specifics, but if she ever decides to write a memoir, readers will definitely be in for a good tale.

"You would just be in shock," she teased. "It's a really good, juicy story."