06/07/2013 at 02:00 PM EDT
Baby on board?
In photo taken Wednesday night in London, Avril Lavigne
looks like she could be expecting.
The Canadian singer, 28, who's engaged to Nickelback frontman Chad Kroeger, hasn't commented on the speculation, but a source tells PEOPLE that she is not
Reports suggest the wind may have simply been playing with her dress as she left her hotel.
Kroeger, 38, popped the question
last August after dating Lavigne for six months.
The couple have not revealed a wedding date, but Lavigne recently said her fiancé should expect great things.
"It's going to be quite spectacular, and there's a theme to it," /people/article/0,,20689613,00.html she said. "We're going pretty big, but Chad doesn't even know everything."
Reporting by JULIE JORDAN