The couple only confirmed their engagement in July, despite rumours circulating since December of last year.
While Biel recently insisted that she has done nothing to plan her wedding to Timberlake, it has since been suggested that they will marry in a small ceremony to be held in Montana in a few weeks' time.
"They have vacationed there many times before both in summer and winter and absolutely adore the location," a source told Celebuzz of the exclusive Yellowstone Club in Big Sky where the stars will reportedly exchange vows.
"It's away from the hustle and bustle of Hollywood and it's just beautiful there. The laid back lodge feel is totally their vibe."
The 13,450-acre private ski and golf resort is said to be the best in the area, with five star amenities and several celebrity members.
Biel recently revealed that she takes clothing advice from Timberlake as they are both very interested in fashion.