It鈥檚 an exciting time for Chrissy Teigen and hubby John Legend. The couple just revealed that they鈥檙e expecting baby No. 2! And they shared the news with the help of their adorable 18-month-old daughter, Luna.

The 31-year-old model took to Instagram today to make the big announcement. In a video of herself and her little one, Teigen gestures to her stomach and asks, 鈥淟una, what鈥檚 in here?鈥 The toddler sweetly replies, 鈥淏aby!鈥 Happy laughs can be heard in the background as the sweet soon-to-be big sister looks at her mom鈥檚 belly and continues to say, 鈥淏aby.鈥

Teigen captioned the video using her ever-cheeky sense of humor, joking, 鈥淚t鈥檚 John鈥檚!鈥

it's john's!

A post shared by chrissy teigen (@chrissyteigen) on

The cookbook author and the 鈥淎ll of You鈥 singer revealed back in October that they were ready for their second child, which they were hoping to conceive with the help of IVF.

Teigen has been incredibly open about her fertility struggles in the past. As she told InStyle, she started with 20 embryos during their first IVF round, and though three were viable, she explained, 鈥淭he first little girl didn鈥檛 work, and then the second is Luna.鈥

This time around, she told Entertainment Tonight, 鈥淥h my god, a little boy is next for sure.鈥

We can鈥檛 wait. Congratulations to the growing family!

Are you excited that Chrissy Teigen and John Legend are having a second baby? Let us know @BritandCo!

(Photo via Frazer Harrison/Getty)