Singer Lee Hyori is to tie the knot with her boyfriend Lee Sang-soon, a renowned guitarist and singer in Korea, in September, according to news reports on Wednesday.

Reports said that the upcoming wedding came to light as news spread about the couple preparing wedding invitations. The two have been together since 2011.

Lee Sang-soon (left) and Lee Hyori are seen in a screenshot from SBS' "Thank You" on June 7. (SBS)

However, the news of the impending wedding has not been officially confirmed, with Lee Hyori's agency B2M Entertainment changing its statements throughout Wednesday.

The CEO of the agency Kil Jong-hwa told a media outlet that it is only a rumour and denied reports of wedding invitation cards, while another official at the agency acknowledged the existence of wedding invitations. In yet another unconfirmed report, the couple is to wed on Sept. 1 on Jeju Island.

Meanwhile, Lee Hyori in the past talked about the issue of a wedding while on a television programme.

"I can't give a definite answer yet, but if I do marry someone, I wish it would be Lee Sang-soon," she said on SBS' talk show "Thank You" on May 31. The couple appeared together on the same show on June 7.