Fergie and Josh make baby music
Fergie and her husband Josh Duhamel are writing songs together but they're for an audience of one - their baby son, Axl.
"We have our own little home-written songs," Fergie said in an interview, noting their three-month-old loves their "little ditties".
"We harmonise and we sing together," the Black Eyed Peas songstress said before singing part of one tune that began with "Baby you're my baby" and adding: "We can be quite corny."
She usually sings Silent Night to put Axl to sleep because it "sounds like a lullaby".
Fergie also said she and Josh play Rockabye Baby! CDs with music from artists such as Bob Marley and Led Zeppelin and "mommy's rap music" from artists like Kendrick Lamar.
As for swear words in rap, she said: "I have to figure out how I'm going to deal with that 'cause mommy loves her rap."
Axl is the couple's first child. She and Josh have said they want a second child and Fergie said she wants to stop at two.
The 38-year-old singer said being in "mommy mode" is what prompted her to partner with Unilever's Project Sunlight campaign that launches in conjunction with Universal Children's Day. She said the initiative is about making the planet a better place for children.
"I have an urge to help children everywhere," she said.
Project Sunlight encourages individuals to take steps "to live more sustainably". As part of the initiative, Unicef, the World Food Programme and Save the Children are providing school meals, safe drinking and hygiene education to two million children worldwide.
Fergie said she and Josh are taking steps to "create a brighter future for our children" by driving a hybrid vehicle, recycling and planting an organic garden at their home.
She said she is thinking about returning to work on a solo album at some point in the future. "I've got my notebooks, I've got my iPhone and I've got ideas."
Will any of the songs she and Josh co-wrote be included? "You never know," she said with a laugh. "Maybe we'll put them on as interludes."