Kelly Rowland has reportedly married her manager fiance in a secret ceremony.

Kelly, 33, and Tim Witherspoon tied the knot in Costa Rica on May 9 in a simple and intimate wedding with around 30 guests, according to Us Weekly.

Kelly was reportedly joined at the ceremony by former Destiny's Child bandmates Beyonce and Solange Knowles. The sisters are said to have flown to the wedding together by private jet.

Beyonce posted a picture on her Instagram account the day of the wedding in what may have been a bridesmaids dress, with ornate straps. She simply captioned the photo: "Good morning."

Kelly confirmed she was engaged to Tim in December 2013 during an appearance on The Queen Latifah Show.

She revealed: "He put a ring on it. It's been a while. We've kept it very, very low - for years, to be completely honest."

Kelly also revealed Tim proposed on Skype, adding: "It was so late - we were just staring at each other."

The singer was previously engaged to football player Roy Williams but they split in January 2005.