Fergie and Josh Duhamel [Photo/Agencies]

Fergie and her husband have written lullabies for their baby.

The Black Eyed Peas star, who has described parenthood as an "amazing" experience, says her and her husband, actor Josh Duhamel, have been collaborating penning songs for three-month-old son Axl Jack.

The 'Duchess' singer said: "We have our own little home-written songs. We harmonise and we sing together. We can be quite conrny", adding that her son loves their "little ditties."

Fergie revealed she sings 'Silent Night' to her little one and plays Rockabye Baby! CDs, featuring music by Bob Marley and rockers Led Zeppelin.

She has also introduced Axl to 'mommy's rap', including the likes of Kendrick Lamar.

As for swear words, she said: "I have to figure out how I'm going to deal with that cause mommy loves her rap."

Fergie initially struggled to adapt to the unpredictable routines that come with raising an child but she's learnt to balance her life.

She explained: "I'm a scheduler, I'm a planner, so I just really have to live more spontaneously and just, kind of, when he's ready to learn and be fed and he's ready to react and respond to me - he's first priority - and my emails will have to wait."

For more coverages on Fergie, click here