"Right now they are just enjoying the news for themselves," a friend told Us. "They just want a happy baby."
Biel, 32, and Timberlake, 33, have been married since January 2012, and were together for five years on and off before that. By all accounts, their last two years of married life have been pretty blissful.
"It's weird because it feels like almost nothing has changed, yet something that you can't really describe, or something that isn't tangible, has changed," Biel told Ellen Degeneres shortly after returning from the couple's honeymoon. "It just feels incredible."
A year later, Timberlake said the same thing when he too swung by "Ellen" for a visit.
"It's nice to marry your best friend. It suits me," he said. "Every once in a while I can catch a glimpse of her when she doesn't see me looking, and I have this moment where I'm like, 'If you never make a good decision … if you only make bad decisions for the rest of your life, you made one really good decision.'"