The 64-year-old star has been dating model Araujo, 31, since the start of 2010 and friends of the pair claim a wedding could be on the cards in the next few months.
A source said to UK newspaper Daily Express: 'Ronnie knows that Ana is the girl for him and he plans to spend the rest of his life with her. There's now talk of a wedding towards the end of the year.
'It could quite possibly happen over Christmas.'
A pal added: 'Ronnie is in a great place on a personal level. He's sober and at his most creative in years. The idea of growing old with Ana at his side really appeals.'