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/ Source: TODAY
By Erin Clements

It's no secret that Renee Zellweger's title heroine has a little one on the way in the upcoming flick "Bridget Jones's Baby" — but it's less clear who the father is.

While fans of the franchise might assume the baby's dad is Mark Darcy (Colin Firth), Bridget's beau from the first two films, the addition of Patrick Dempsey to the third installment's cast complicates matters.

Exclusive... 51929796 Renee Zellweger seen filming 'Bridget Jones's Baby' with co-stars, Colin Firth and Patrick Dempsey at the UCLH in London, UK on December 06, 2015. Renee Zellweger seen filming 'Bridget Jones's Baby' with co-stars, Colin Firth and Patrick Dempsey at the UCLH in London, UK on December 06, 2015. Pictured: Patrick Dempsey, Renee Zellweger, Colin Firth FameFlynet, Inc - Beverly Hills, CA, USA - +1 (818) 307-4813 RESTRICTIONS APPLY: USA ONLYFAMEFLYNET PICTURES

And new photos from the movie's set that show Zellweger being carried toward a hospital by both leading men don't clarify the premise either, though we're certainly excited to see them anyway.

Exclusive... 51929802 Renee Zellweger seen filming 'Bridget Jones's Baby' with co-stars, Colin Firth and Patrick Dempsey at the UCLH in London, UK on December 06, 2015. Renee Zellweger seen filming 'Bridget Jones's Baby' with co-stars, Colin Firth and Patrick Dempsey at the UCLH in London, UK on December 06, 2015. Pictured: Patrick Dempsey, Renee Zellweger, Colin Firth FameFlynet, Inc - Beverly Hills, CA, USA - +1 (818) 307-4813 RESTRICTIONS APPLY: USA ONLYFAMEFLYNET PICTURES

Dempsey is seen grabbing Zellweger's legs, while Firth holds her top half in the images, which also reveal Bridget's prominent baby bump.

Exclusive... 51929820 Renee Zellweger seen filming 'Bridget Jones's Baby' with co-stars, Colin Firth and Patrick Dempsey at the UCLH in London, UK on December 06, 2015. Renee Zellweger seen filming 'Bridget Jones's Baby' with co-stars, Colin Firth and Patrick Dempsey at the UCLH in London, UK on December 06, 2015. Pictured: Colin Firth, Renee Zellweger FameFlynet, Inc - Beverly Hills, CA, USA - +1 (818) 307-4813 RESTRICTIONS APPLY: USA ONLYFAMEFLYNET PICTURES

Filming on the much-anticipated movie, the follow-up to 2001's "Bridget Jones's Diary" and 2004's "Bridget Jones: The Edge of Reason," began in the U.K. on Oct. 2. The film, set for release in September 2016, will take place between "Edge of Reason" and the third book in Helen Fielding's series, "Bridget Jones: Mad About the Boy."

RELATED: Renee Zellweger, Patrick Dempsey are on board for 'Bridget Jones's Baby'

While the announcement of Dempsey's yet-unnamed role has generated plenty of buzz, only time will tell who the McDreamy actor's character will be.