Lady Gaga, Ellen DeGeneres and Pharrell Williams have teamed up on a new campaign for the beauty giant Revlon.

The trio star in the brand's latest video for its social campaign "The Love Project," which aims to raise money for charities including the WHA (Women's Heart Alliance), the Born This Way Foundation founded by Lady Gaga in 2012, From One Hand to AnOther and the Trevor Project.

The video sees the stars explaining what love means to them, with their definitions ranging "love is a light in the dark" (Pharrell), to "love is why we're here" (Ellen) and "love is being at my Grandma's house" (Lady Gaga). The soundtrack to the film is Lady Gaga's single "A Million Reasons."

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The campaign is urging people to share their own definitions, using the hashtag #Lovein3words, as well as donating to the charities, which cover issues such as kindness, heart disease, young people's counselling and investing in future generations.

"The Love Project is the beginning of a social movement which aims to inspire more love, acceptance and caring in the world," People reports Revlon Senior Vice President Marketing Carlos Barreto as saying in a statement. "At the heart of this campaign is the belief that all people are beautiful and that love can create a better world."

This is not the first time Revlon has campaigned in the name of love. This January, musician Gwen Stefani defended the brand's "Choose Love" campaign, which had come under fire from some quarters for, it was felt, telling women to freshen up their look in order to freshen up a relationship. Stefani, who joined Revlon as a campaign star this year, said at the time: "They have this Choose Love campaign, which is full of choice and positivity and dreams and truth and I feel like that's aligning exactly with where I'm at in my personal life in the last couple of years and how I've had to kind of choose love, choose truth, choose to be positive and work my way back to a place of using my gift and sharing my love with people."