The Simple Life star is due to give birth to the couple's first child early next year.
Joel said recently on US television: 'Obviously, marriage is in our future. I don't know when or where or how, but right now our priority is our family and the baby.
'That's all we've been thinking about. We are in love and are really happy.'
The Good Charlotte rocker Joel is now said to have bitten the bullet and proposed to Nicole, but so far the couple has been elusive about the date of the nuptials.
However TMZ.com claims that 26-year-old Nicole has accepted Joel's proposal and wedding preparations are already underway.
It is reported the happy couple are planning a wedding in Laguna, California on October 13th.
Nicole's representative has yet to comment.
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