Fergie is wishing fans a "jolly holiday".

The Black Eyed Peas singer shared an adorable snap of her four-month-old baby boy Axl smiling for the camera on her Instagram account as her family prepared to celebrate his first Christmas.

The bright-eyed tot wears a striped shirt and monogrammed bib in the image, which his proud mother captioned: "Have a Jolly Holiday!"

Within minutes, thousands of followers had liked the photo, and wished Fergie and her family the same.

"Your son is adorable," one follower wrote.

Another added: "What a happy baby! Merry Christmas!"

Fergie has been showing off baby Axl to fans on social media sites in recent weeks.

The last photo she posted on Instagram was of husband Josh Duhamel lovingly kissing their baby boy.

Josh recently gushed over the newborn, the couple's first child, who was born on August 29.

"We can't stop staring at him," he told E! News.

"He's our little man - we made him together. There's something you can't really describe until you go through it. I think any parents out there would understand that."

Fergie recently admitted becoming a mother has also changed her approach to music.

She says she's become more interested in singing nursery rhymes than conjuring up a chart-topping tune.

"The songs that are written [lately are] little ditties and Josh and I sing them to our child," she told People magazine, musing, "They're quite funny."

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