Is Jennifer Garner pregnant?

Rumors the 43-year-old actress may be expecting her fourth baby with estranged husband Ben Affleck have been running rampant this week — and Jen's latest outfit is totally adding fuel to the fire!

RELATED: Jennifer Garner Steps Out Wearing Her Wedding Ring Amid Divorce from Ben Affleck

The 13 Going on 30 star stepped out wearing a flowy white top, loose-fitting jeans and a pair of flats while out and about in LA on Monday, Oct. 5, leading many to speculate she may be trying to hide a growing baby bump.

ben affleck and jennifer garner

Ben and Jen in January 2014.

“Ben and Jen have been spending a lot of time together and they’ve decided to keep working on their relationship,” a source recently told Ok! Magazine of the couple, who announced their divorce after 10 years of marriage in June.

"Something is definitely going on as Jen keeps saying how exhausted she is," the insider continued, adding the actress has told a few close friends that the only other time she's experienced this level of fatigue has been during her past pregnancies.

RELATED: Ben Affleck and Jennifer Garner Moving Into New LA House With Kids Amid Divorce

Ben, 43, and Jen — who tied the knot in June 2005 — are already parents to three children, daughters Violet, 9, and Seraphina, 6, and son, Samuel, 3.

Click through the gallery below to see all the photos of Jen’s bump-concealing outfit