British tennis star Katie Boulter has announced her engagement to Australian ace Alex de Minaur.

Boulter, 28, has been with 25-year-old De Minaur for more than four years and on Monday morning shared a picture of the couple together – with a ring showing on her finger.

“We’ve been keeping a small secret,” she wrote in a caption, with a smiling face emoji.

A list of well-wishers left comments below her post after the announcement.

It’s not yet clear when the tennis pair plan to tie…