It's going to be a memorable year for longtime Hong Kong lovers Athena Chu and Paul Wong.

Rumours about them heading down the aisle never ceased since they got together 13 years ago, yet this year, the couple are about to make it a reality this year.

Wong, a singer-songwriter and the lead guitarist of the Hong Kong rock band Beyond, confirmed that his 40-year-old girlfriend is indeed three months pregnant and that he plans to make an honest woman out of Chu by end of this year, after the baby is born.

The pair made this announcement when they were swarmed by the media at the Hong Kong airport recently.

Since yesterday afternoon, speculations were rife that Chu is pregnant, after she uploaded a black and white nude picture featuring her and Wong locked in an embrace on her Weibo and hinted that she's about to be a mother.

Despite being together for more than a decade, Wong, 48, claimed that the pregnancy was not in the plan, though they have always planned to tie the knot by end of this year.

"It's kind of sudden," he said about the pregnancy, adding that he only knew about it during his birthday last month.

"We only knew about it slightly earlier than you guys, so we didn't have any plan. Although we were kind of stunned, this is the best birthday present ever," he gushed.

Chu, who hid behind her lover and held his hand tightly throughout, was moved to tears when asked about her current feelings.

As for the nude picture, Wong explained that it was taken by their pal, Hong Kong renowned photographer Wing Shya, and described the act as "fun and interesting".

Fans can expect more as he promised to take more pictures of Chu's baby bump in the future.