The couple - who only started dating four months ago - are reportedly ''already discussing having children together''.
An insider shared: ''Britney has said that Charlie wants to have children of his own and thinks that she would be the perfect mother for them.''
The 'Toxic' hitmaker - who already has Sean, nine, and Jayden, eight, from her previous marriage to Kevin Federline - returned to Las Vegas to continue her residency at Planet Hollywood, with the new couple appearing to stay ''tied at the hip''.
The source added to RadarOnline.com: ''[She] brought Charlie along with her this past weekend and they were tied at the hip.
''They literally cannot keep their hands off of each other.''
Meanwhile, rumours recently circulated that the 32-year-old TV producer was planning to propose to the 33-year-old singer, having already received the blessing of her father, Jamie Spears.
A source said previously: ''Charlie pitched Jamie about casting Britney in a new reality show, and Jamie thought he was a really good guy.
''They've been moving closer at light speed, and when Charlie suggested to Jamie that he ask for Britney's hand in marriage, Jamie quickly said yes.''
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