Jonas, 26, is very happy his friends are expecting a baby together after battling infertility, reported Female First.
"She's the funniest girl. And he nurtures and cares for everything around him. They're going to have the most beautiful child," he said.
The 29-year-old model is said to "excited" to be four months pregnant even though she is experiencing some negative symptoms.
The couple announced the happy news just a few weeks after Teigen was reduced to tears when she opened up about her struggles to conceive on her new talk show "The FABLife".