Oh, Baby! The TRUTH About Beyonce's Bump

RadarOnline.com has exclusively learned that with her marriage back on track, Beyonce has decided what she wants to give her hubby Jay Z something to celebrate this Christmas — a second child!

Despite recent sightings of the singer with a tell-tale bump, insiders insist she is NOT pregnant — YET!

According to a source, she's vowed to get pregnant with baby number two by the end of the year.

"It's Jay Z's birthday in December too so it will be a double celebration," an insider told RadarOnline.com of the rapper, who will be turning 47.

As RadarOnline.com reported, the couple, who are already parents to 4-year-old daughter Blue Ivy, had been warring and were on the verge of a split amid rumors he cheated with various women.

"There was a time not too long ago that she thought they'd never get back to this place again," said the insider, "but they've worked through all their skeletons and there's still real love there."

"Beyonce knows Jay wants them to move forward and get their lives together back on track — and this is the best way to do it," continued the insider.

While it remains to be seen if 34-year-old Beyonce will be successful in fulfilling her wish to become a mom again, "she's trying to time everything so she can surprise him in December, which means planning a lot of one-on-one time together at the end of September, October," said the insider.

"Now that she and Jay are tight again, Beyonce doesn't want to waste any more time."