Kelly Rowland Photo by: Michael Loccisano / FilmMagic
Kelly Rowland Still Keeping Mum on Beyoncé Wedding | Kelly Rowland
The marriage license has been filed – as PEOPLE first reported last month – but Kelly Rowland is still playing coy when it comes to Beyoncé Knowles's hush-hush wedding to Jay-Z.

The singer – a founding member of Destiny's Child – was in London Wednesday night at the LG Scarlet TV launch party promoting her remix album, Miss Kelly: Diva Deluxe.

But she could not be tempted to discuss her BFF's April 4 wedding, which she attended.

"I just spoke to Beyoncé last night, and she is very happy," Rowland – who is already hard at work on her third solo album – told PEOPLE at the LG Scarlet TV launch party.

So married life is treating Knowles well? "How do you know there's been a wedding?" she replied playfully. "This is something you need to ask Beyoncé and Jay."

• Reporting by MARIANA GREBLER

Like this story? Click on the Yahoo Buzz! button below to Buzz it up!