Gwen Stefani bonds with her sons Zuma, 16, and Apollo, 10, after becoming “unrecognizable” on The Voice

Gwen Stefani looked like a loving mother with her sons in Los Angeles on Sunday.

The 55-year-old No Doubt singer, who was recently spotted shopping for Halloween essentials, looked age-defying and showed off her slim figure as she attended her son Apollo's flag football game.

She wore an oversized navy shirt and booty shorts paired with leggings and denim cowboy boots.

Her bleached locks were pulled up into a bun while she wore chunky designer glasses and gold bracelets.

The Hollaback Girl singer wore a flannel shirt over her shoulder and carried a chic mini handbag with a stuffed animal embellishment as she sipped her coffee.

Gwen Stefani looked like a loving mother with her sons in Los Angeles on Sunday

She was accompanied by her 16-year-old son Zuma Nesta Rock Rossdale, who wore a red jersey and jeans and carried a soccer ball.

Apollo, 10, appeared to be in good spirits as he prepared to take on his opponents in a game of flag football.

However, the starlet's eldest son, Kingston Rossdale, 18, was missing from the family outing.

Gwen shares her three sons with her ex-husband Gavin Rossdale, whom she was married to from 2002 to 2016. She filed for divorce back in 2015, citing irreconcilable differences.

The first connection between them came in 1995 when their band No Doubt opened for his band Bush at one of their concerts.

No Doubt – her band from Anaheim, California – was founded in 1986 by the blonde bombshell herself.

For most of the time, the group consisted of drummer Adrian Young, guitarist Tom Dumont and bassist Tony Kanal, while the 54-year-old singer took on lead vocals.

Gwen's brother, keyboardist Eric Stefani, was also a former member of the group when it began releasing albums in 1992.

Although their self-titled debut album didn't do as well as planned, “The Beacon Street Collection” – their second album – sold over 100,000 copies in 1995, propelling the group to fame.

Since then, the band has released six studio albums, five compilation albums and three video albums.

In November 2015, the singer entered into a romantic relationship with country icon Blake Shelton (48). An insider confirmed their relationship to People at the time.

“Everyone is thrilled because they are both incredibly nice people,” the source said.

After dating for six years, the duo married on July 3, 2021. The lovebirds tied the knot in a small, intimate ceremony at Blake's ranch in Oklahoma and have been inseparable ever since.

Earlier this week, Gwen caused a stir after appearing on NBC's The Voice in an “unrecognizable” new look. The pop star ditched her signature icy platinum locks for new warm blonde wavy locks with distinctive bangs.

She wore an oversized navy shirt with denim booty shorts, leggings and denim cowboy boots

But fans were quick to comment that there was something else different about her appearance besides the hair and dress, pointing to her plumper and smoother facial expression.

Dr. Corey Maas, a facial plastic surgeon in San Francisco, suggested that the fuller look of her face may be due to fillers, which plump wrinkles, smooth lines and restore volume to the face.

He also hinted that Gwen may have had a lower face lift, saying he didn't see any loose skin on her lower jaw, which he would expect in someone her age.

Gwen shares her three songs with her ex-husband Gavin Rossdale, whom she was married to from 2002 to 2016; seen in February 1997

No Doubt – her band from Anaheim, California – was founded in 1986 by the blonde bombshell herself; Tony, Gwen, Adrian and Tom seen in May 2015

In November 2015, the singer entered into a romantic relationship with country icon Blake Shelton (48); seen in May 2024

After six years of dating, the two coaches from The Voice tied the knot on July 3, 2021; seen in October 2024

Gwen Stefani is pictured above in 2006, left, and then earlier this week on The Voice. Plastic surgeons have suspected that she had fillers on her face and lips. In the left picture she is 37 years old – in the right she is 55 years old

Dr. Maas told DailyMail.com after looking at pictures of Gwen on The Voice: “It's true that people with bangs, pulling them down causes them to focus more on the middle of the face and concentrate below the eyes, which results in (cheeks and midface) appearing slightly fuller.

“But I also wouldn't expect (that area) to be that full on someone her age, so she probably had some filler.”

He added: “Her jaw also clearly indicates work, a 55-year-old woman simply doesn't have a jaw like that.”

“I think she may have had a facelift on the lower part because it really tightens her jawline and chin and hers are almost perfect.”