They have barely left each other's side since they met at Elton John's Oscar party last month and have gushed about their whirlwind romance.But Katie Price was today warned that her new man might not be the man she thinks he is, after his ex-girlfriend said he left her after she had his baby.
And she told the glamour model - who she called a 'stupid rich girl' - that Leandro is only after her for her fame and fortune and is using her to become a celebrity.
Speaking to the News of the World, Romina Brizzo, 25, said: Leo loves to date wealthy girls.
'Jordan is no different. She is just another stupid rich girl who has fallen for his charms. He looks innocent but he isn't.'
Romina met Leandro in Argentina five years ago but three months into their relationship, she discovered that she was pregnant.
And she said that he 'ran away' when he found out and although he was there for their daughter Sofia's birth, he barely sees her.
Speaking to the News of the World, Romina said: 'We knew it was going to happen. We didn't use protection. Leandro used to say he wanted to be a young father.'
But the former model said when she got pregnant, Leandro told her he didn't want it and started seeing other women while she was pregnant.
She said: 'Even before the birth he was seeing other women. He came to the birth but looked really scared as he held Sofia.'
And Romina said she had to take him to court to pay child support after failing to financially provide for his child for two years.
However, despite only seeing his three-year-old daughter three times a year, Leandro is planning to introduce his little girl to Katie - and Romina had to help set it up.
She said he has organised a family gathering in Cordoba in Argentina next week and added: 'I spoke to him and Katie on the phone. I had to speak to her in English because she couldn't understand what Leo was saying.'
But last night, he hit out at her accusations and told the paper: 'I've no wish to get into a slanging match with the mother of the child I love very much.'
New love: Katie and Leandro, seen here at the races last week, met at Elton John's Oscar party last monthLeandro also spoke for the first time about his whirlwind romance with Katie and said their love knows no boundaries.
The 25-year-old also hit out at her ex-husband Alex Reid, who he accused of wanting to 'damage' her, and said she is 'divine', 'humble' and normal'.
Speaking to the Sunday Mirror, Leandro, who is seven years younger than the glamour model, said it was him that made the first move, not her, as reports suggested.
He said: 'I made the first move, not her as everyone’s said. We started talking, had a drinks and we became intimate. That’s just how it happened.'
A few days later he flew to the UK to stay with her at her and her family at her Surrey home, and instantly became part of her life, even appearing in her fly-on-the-wall series for Sky Living
He has also found himself caught up in the ongoing divorce saga between and her estranged husband Alex Reid - but Leandro said Katie is not to blame for anything.
Leandro, who has modelled for Louis Vuitton, said: 'Alex always wanted to damage Katie. Her ex-partners say anything about Katie as long as they can make money.
'Katie is very family-orientated, humble and much more normal than many other people who talk about her.'
Doting: Leandro holds onto Katie's son Junior - but his ex Romina said he rarely sees his own daughter Sofiasource:dailymail