DailyMail.com reports that Biel's mom is with the brood.
The details are sourced to a friend of Biel's mom, who also confirms that the entire family will be together through this weekend.
How did they pull off Biel's secret pregnancy? A bare minimum of selfies on social media — and none showing Biel's entire body for months. Biel also posted videos and images from last year to throw people off the scent.
They could not, however, resist a little bit of a hint — Timberlake posted a shot from behind showing the couple in matching PAPA BEAR and MAMA BEAR robes in May.
The couple first met in early 2007, calling it quits in 2011 before reuniting and getting engaged late that year. They wed on October 19, 2012.