The pop star turned actor proposed to his long-term girlfriend over Christmas, and reports suggest they will tie the knot before the end of this year.
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Biel 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" actress also admits she would like to emulate British actress Emily Blunt, who married John Krasinski of "The Office" 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.'"