London, July 7 : Soccer ace Cristiano Ronaldo has paid a whopping 10 million pounds to the mother of his baby in order to buy her silence, according to pals.

The 25-year-old is said to have transferred the amount to her in return for her giving up any rights to see the child and swearing her to total secrecy.

"He paid nearly a year''s wages but it''s more than worth it. He''s called it the most expensive day of his life, but at least he has sole custody," the Sun quoted a source as saying.

Even Ronaldo's son will not know the identity of his mother until he is old enough to understand.

A source described the mum as `a party girl' and not someone the footballer would `settle down' with.

But rumours are abuzz that she is an American surrogate mum - and the pregnancy was deliberate.

The baby boy - born on June 17 - is staying with Ronaldo''s family in Portugal''s Algarve.

He wants his mum Dolores and sister to help raise his son.

Meanwhile, Ronaldo has dismissed rumours that his lingerie model girlfriend Irina Shayk, 24, is upset over the child. (ANI)