Actress Shiri Appleby is expecting her first child with fiancé chef Jon Shook later this month. The "Girls" guest actress posted a picture of herself soaking up the sun on a beach in Los Angeles on her Instagram account Friday.

Dressed in a string blue bikini, which was almost hidden under her big belly, the 34-year-old sported a casual look with loose hair and a pair of dark shades. Along with the picture in which she looks heavily pregnant she wrote, "T minus 20 days," Us Magazine reported.

Click here to see the Instagram picture of the heavily pregnant Shiri Appleby.

While Appleby is not shy to show off her huge belly, she and Shook have decided to keep the sex of the baby a surprise. Appleby told Us Magazine earlier, "He really wanted to do it and it sounded like fun. It's really made the whole pregnancy a heightened excitement because you just don't know what it's going to be!"

Shook proposed to Appleby in August 2012 at his restaurant Animal, but a date for the wedding has not yet been set. He also owns the upcoming restaurant Son of a Gun.

In late January, Appleby celebrated her baby shower at her fiancé's restaurant with 50 of her female friends. She also told the magazine that the pregnancy has brought her closer to Shook.

The former "Chicago Fire" actress said: "When you see this guy going to all the doctor's appointments with you and you tell him you're feeling a certain way and two minutes later he's looked it up on the Internet to tell you that it's normal, you realize that you're really starting a family with somebody, and it's just -- there's no way to look at that person and not be more in love."