Jessica Biel is spending "very long days on set" as her due date approaches.

Jessica Biel

Jessica Biel

The 32-year-old actress is set to welcome her first child with husband Justin Timberlake into the world in "late March or early April" but returned to work on her upcoming film, 'The Devil and the Deep Blue Sea,' in New Orleans last week, which she is both starring in and producing.

A source said: "She spends very long days on set.

"Jessica is not receiving any special treatments. [She] has a very plain car with a driver and besides that walks with everyone else."

The actress has been "very friendly and sweet to everyone" around her.

The insider also told E! News: "Jessica looks great, glowing. She does not have make-up for her role, but despite no make-up, she looks really really good."

The 'Total Recall' star, who "everyone seems to love," has formed a close bond with her co-star Jason Sudeikis, but here have been "no signs of Justin Timberlake" on the set to date.

Jessica has kept busy throughout her pregnancy, as she is also planning to open her first child-friendly restaurant, Au Fudge, in Los Angeles shortly after this gives birth.