Tennis' most famous playing couple Kim Clijsters and Lleyton Hewitt are talking about tying the knot, the Belgian revealed.

World No.2 Clijsters, who has reached the quarter-finals at the French Open and will turn 20 the day after the women's final on Sunday, said that she and her world No.1 boyfriend Hewitt, who has already been eliminated from the tournament, have discussed getting married.

"We do talk about it sometimes," Clijsters told French television. "But I'm still young. I'm going to be 20 in a few days. Lleyton, he's 22. So I think we have time."

But Clijsters admitted that she was considering a change in residency because of the amount of taxes she pays in Belgium, and did not rule out becoming an Australian citizen.

"People have been saying a lot of things. I'm thinking about changing residency, and I spend a lot of time in Australia, but I'm really happy to go home from time to time."

Clijsters' father Leo, a former Belgian international soccer player, revealed that she pays the taxman between 50 and 60 percent of her earnings, much less than footballers in Belgium.

The player from the northern Flemish-speaking part of Belgium admitted that her life has totally changed since reaching the finals here two years ago when she was catapulted to the status of national heroine.

"My life completely changed after the 2001 finals. When I returned all the street was covered with flags," said Clijsters, who hopes to become the first Belgian ever to win a Grand Slam event.

"I realise how important it is for people, particularly when you play in Paris there are a lot of Belgians who come."

Clijsters, who has won 12 WTA titles, takes on Spain's former Wimbledon champion Conchita Martinez, the 24th seed, for a place in the semi-finals.

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