Brand, who began dating Perry in September (09), sparked rumours he would settle down with the I Kissed A Girl hitmaker after he was photographed shopping for a diamond ring at a Cartier jewellery store earlier this month (Dec09).
According to Britain's Daily Mirror, the Forgetting Sarah Marshall star proposed during Perry's trip to his native Britain last week (begs21Dec09).
A source says, “He asked her to marry him last week and she quickly said yes.
"They don’t know when the wedding will be but they are planning to make it in 2010 if the schedules can work. Russell is searching for a jewellery designer to create a ring in time for the New Year."
Spokespersons for Perry and Brand were not available for comment as WENN went to press.