Chrissy Teigen is concerned about how "huge" her nose has got.

Chrissy Teigen's swollen nose (c) Twitter

Chrissy Teigen's swollen nose (c) Twitter

The 32-year-old model is just weeks away from giving birth to her second child - a baby boy, whom she's expecting with her husband John Legend - and she's amazed by how much thicker her hooter has become in the final three months of her pregnancy.

Taking to her Twitter account, the brunette beauty uploaded a video of her husband boogying to Beyonce's 'Single Ladies' behind her, before noticing how wide her snout was.

She wrote: "damn my pregnancy nose is huge. my nose has its own bmi. how you gonna gain weight in your nose. this is fascinating (sic)"

The 'Lip Sync Battle' host also has two-year-old daughter Luna with the 'All of Me' hitmaker but has admitted her second pregnancy has been a lot harder than the first time around.

She said recently: "Your second pregnancy is harder because you have a kid already."

And 39-year-old John added: "You have to divide your energy between raising a kid and and carrying one as well."

However, although they're looking forward to meeting their bundle of joy, the couple are concerned about how well Luna will adapt to having a sibling.

John said: "Luna's gonna be an issue. I think she'll probably have some growing pains because she's currently running the house right now. She's used to being the centre of everything right now so we'll see how she adjusts to sharing the spotlight."

The 'Good Night' singer has been reading tips on how to make sure Luna doesn't feel jealous of her brother, including buying a gift from the baby to "give" to his older sister.

John added: "I've [also] heard that I should bring Luna to him so it doesn't feel like we're all just sitting there with this new guy, like, 'Who this?'"

Chrissy and John - who married in 2013 - announced they were expecting another child in November last year, with an Instagram post which featured Luna pointing at her mother's belly and saying "Baby! Baby!"