Another Twin's secret is out - she's married, but not for much longer

It turns out the other Twin had a secret, too.

Charlene Choi Tsoek-jin yesterday announced she was divorcing singer-actor Ronald Cheng Chung-kei. It was the first confirmation they had been married.

At a press conference Cheng said he and Choi, affectionately known as 'Ah Sa', had secretly married in Los Angeles in 2006. At the time, Choi's co-star in the acting and singing duo Twins, Gillian Chung Yan-tung, was still seeing on-off boyfriend Edison Chen Koon-hei, whose sexually explicit photos of her were later to land on the internet and derail the duo.

'We were happy about our decision and we had our parents' support,' Cheng said. 'Ah Sa and I always think that marriage is a private matter, and that there is no need to share this with other people.'

The pair called a press conference at Kowloon Bay's Hong Kong International Trade and Exhibition Centre after Chinese-language newspaper Apple Daily yesterday revealed the existence of a marriage certificate in their names.

Cheng, 37, said his marriage with Choi, 10 years his junior, had been a happy one but that they had come to the conclusion they should go their separate ways. He is the son of music industry heavyweight Norman Cheng Tung-hon, the head of record company Gold Typhoon.

'We realised that separation would be good for us,' Cheng said. The separation had nothing to do with a third party, he said. 'It was a rational decision.'