Kelly Brook ''probably shelled out'' for her own engagement ring.

The busty brunette's beau David McIntosh popped the question last month and she announced the news by posting a snap of her and the former 'Gladiators' star holding a balloon with the words 'Engaged' emblazoned across the front from her Instagram account.

However, sources allege David is ''hardly'' romantic and believe Kelly may have paid for the ring since she's got more money than him.

A source told The Sun newspaper: ''David proposed without a ring and friends think Kelly probably shelled out for her own.

''He's hardly the most romantic man in the world and she's got far more cash than him.''

Kelly and David - a former royal marine - have had an on/off relationship since they met on New Year's Eve (31.01.14) three months ago and it is believed they ''rushed into the engagement''.

Although David spent a large amount of time at Kelly's north London home in the early stages of their romance, the pair reportedly split up shortly after Valentine's Day (14.02.14).

The source added: ''They rushed into the engagement and then realised they needed a ring to prove it's for real when they got photographed together. Her friends are privately saying they don't think the romance will last.''