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Lawyers for the ex-Spice Girl, real name Melanie Brown, said her income had been "dramatically reduced" when she filed court papers petitioning for the monthly child support payment to be increased.

"Until recently, Melanie has been fortunate in her career to sustain a comfortable lifestyle for herself and Angel," the filing, reportedly obtained by MailOnline, read.

"Unfortunately, Melanie's income has dramatically reduced, such that she must consider modifying child support for the first time."

Murphy, who is described in the court filing as an "extraordinary high earner", agreed to make the payments until Angel turns 18.

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The Doctor Dolittle star, up until recently, did not have a relationship with his daughter Angel.

He also denied he was the father when Brown fell pregnant in 2006, before a paternity test later confirmed he was indeed the biological father.

According to reports at the time, Murphy and Brown struck a deal for him to pay $300,000 (A$471,000) a year in child support.

Murphy and Brown met in 2006 soon after the actor's divorce from his ex-wife Nicole Mitchell and dated for nine months. However, they split before Angel was born.

Brown wrote about her brief relationship with Murphy in her 2018 memoir, Brutally Honest, where she gushed about their romance.

"The moment I laid eyes on him it was as if a 2,000-volt electric current had passed between us," Brown said.

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"I felt a hundred different emotions at once, from confused to elated, to happy, to scared, to relaxed to incredulous… and everything in between. 

"I felt I had known this man all my life and that I was staring my destiny in his face."

The singer also described Murphy as the "great love" of her life while promoting her memoir in 2018.

"He always will be," Brown told Good Morning Britain host Piers Morgan. "I mean, I've never really spoken about it before, so [in] this book, I wanted to address it because a lot of people have a misconstrued thing of how everything actually did happen."

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