United Kingdom, Sept. 21 -- Liam Gallagher could be ordered to pay as much as £500,000 a year in child support for his daughter Gemma.

The Oasis singer, 53, fathered Gemma, now 11, with American music journalist Liza Ghorbani in 2013 while still married to All Saints member Nicole Appleton, 49, with whom he shares son Gene, 23, and has been facing new pressure from the mother of the girl to increase his payments as he tours with Oasis.

A source has now told The Sun on Sunday amid her latest push for more cash: "He believed he was already providing Liza with generous maintenance fees."

An insider had previously told The Sun: "It's clear that Liza and her legal team are hoping to cash in on Liam's big tour earnings.

"He's always be...