Russell Brand is reportedly planning to propose to Jemima Khan.

The Get Me To The Greek star is waiting for the perfect moment to pop the question and has apparently commissioned a jeweler to design a custom engagement ring for his girlfriend of five months.

"A proposal is definitely imminent. Russell's been working with a friend of his, jeweller Johnathon Arndt, to create the perfect ring. He wants it to include Buddhist and Islamic symbols - an intertwining of their two faiths," an insider said.

Pals of the couple claim Russell, 38, had hoped to ask for Jemima's hand in marriage to tie in with her 40th birthday celebrations but will now until the ring is complete before jetting off on a romantic holiday. "Russell is planning a trip to Asia for the two of them in the spring, when he intends to propose," the source added.

The proposal could be second time lucky for Russell, who tied the knot with "Roar" singer Katy Perry in 2010 before divorcing almost two years later.

However, the 38-year-old comedian - who has been linked to a string of beauties, including Spice Girl Geri Halliwell - insists he has finally found love with Jemima. During a TV interview with Jonathan Ross earlier this month, he gushed, "I really love her. I'm very, very happy in a relationship that feels very different from anything I've experienced before."