Rumors have been swirling about actress Jennifer Aniston being pregnant and seeking to marry her fiancé Justin Theroux, prior to the baby's arrival. 

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While that speculation has yet to manifest, the 45-year-old actress' recent weight gain has added fuel to the idea that she is truly pregnant this go-round. What's more, apparently her beau Theroux, 42, reacted in a less than flattering manner towards the concept of her being with child.

A source of Life&Style magazine reported that Aniston thought that she may be expecting, so tried to force her fiancé into marrying her by giving him a demanding ultimatum.

"Jen recently thought she was pregnant. When she told Justin, she insisted that he marry her sooner rather than later. Jen really laid it down for him. She said 'Marry me, I'm pregnant! My child needs a father,'" alleged the source.

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However, this demand seemed to have an adverse effect, and Theroux purportedly left town. The source claimed that while he was thrilled about having a baby, he is very hesitant about officially marrying his wife-to-be.

Thus, he asked for time to further ponder the prospect of marriage, and flew to New York City to do so, leaving things 'very cold' with Aniston remaining in L.A. alone. On the contrary, other reports are claiming that their wedding is still on, although Theroux's cousin seems to have no details regarding a possible ceremony.

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