Hollywood star Naomi Watts is desperate to walk down the aisle before she turns 40.

And she's putting constant pressure on Liev Schreiber, the father of their four-month-old son Alexander, to make an honest woman of her before her birthday next September.

'It's not like she's saying marry me or else,' a friend reveals. 'But she keeps reminding him in subtle ways that it wouldn't be right for their son to be raised with parents who aren't married.'

The friend also says that Naomi's never been married and she wants to wear a gorgeous white dress and experience all the joys of being a bride, walking down the aisle and having her best friends as bridesmaids, including actress Nicole Kidman.

'Naomi also made it clear to Liev that she wants to have another baby as soon as possible, and she tells friends there's no way she's going to be an unmarried mum with two kids,' the source says. 'Even with one child she feels it will show a lack of commitment to each other if they don't marry.'

The Aussie actress has been hinting at her timetable to Liev, suggesting that Alexander's first birthday would be the perfect time to tie the knot because he'll be walking by then and could be their ring bearer. And she's even picked out the venue for the ceremony - their luxury home in New York.

The couple have bought a four bedroom, full-floor apartment for $7 million in Manhattan that will be ready mid-2008.

Sexy Naomi, who is set to start filming The Da Vinci Code prequel Angels and Demons with Tom Hanks early next year, has told Liev that she's willing to convert to his faith and have a proper Jewish wedding ceremony.

The problem she faces is that Liev, who just turned 40, has proven to be marriage-shy in the past, partly because he comes from a broken home.

He's also been involved in a string of heartbreaking relationships, including a long romance with Sex and the City star Kristin Davis, which have made him scared of making a long-term commitment.

Naomi comes from a broken home too and admits she's had a series of disastrous relationships with the wrong type of guys - with the exception of her two-year romance with Heath Ledger.

But the King Kong star tells her friends that with Liev she's finally found ‘the one', and insists they'll be together forever.

'My dream is to get married and have children,' she once said in an interview - but she's still only halfway there!