Adam Levine can't wait to have a baby.

The Maroon 5 frontman, who is set to marry his Namibian-born girlfriend Behati Prinsloo in Mexico next month, is reportedly desperate to start a family with her as soon as possible.

A source told the US edition of OK! magazine: ''Adam and Behati want to have a baby right away, and can't wait to start trying.''

The couple, who started first started dating in May 2012 but briefly split last year before reuniting and announcing their engagement, are expected to exchange vows in an intimate ceremony at the Hotel El Ganzo in San José del Cabo on July 19 before jetting to South Africa for their honeymoon.

And the insider said: ''The main focus will be trying for a baby, which Adam is thrilled about! And Behati is dying to be a mom!''

The 'One More Night' hitmaker previously admitted he was eager to become a dad.

During an interview in 2011, he said: ''I don't think you necessarily have to be married to have children.''

However, he is said to have decided to propose to his 25-year-old model girlfriend because ''marrying first was important to her.''