The pop star-turned-actor proposed to his longterm girlfriend over Christmas (11) and reports suggest they will tie the knot before the end of this year (12).
Biel has now revealed they won't be having a big, lavish wedding - and they will probably keep the nuptials secret.
She tells Britain's Hello! magazine, "I do know that it's not going to be a great big to-do. This will be a very private moment for us, so we're going to keep it small and intimate."
The A-Team star also admits she would like to emulate British actress Emily Blunt, who married The Office star John Krasinski at a small ceremony in Italy in 2010.
She adds, "The people I'd most like us to be like are Emily Blunt and John Krasinski - it seemed like one day they were engaged and the next day they were married and nobody had known anything about it. And I did at the time think, 'Aha! That's the way to do it.'"