Former The Hills star Kristin Cavallari has given birth to a baby boy. 

The 27-year-old reality TV star and her American footballer husband Jay Cutler have welcomed the arrival of the their second son, Jaxon Wyatt.

Cavallari revealed their good news on Instagram, posting a picture of her hospital ID bracelet along with baby booties and a navy baby hat. 

Speaking about her second pregnancy earlier this year Cavallari admitted she was suffering much more pain during her pregnancy with Jaxon than she'd had with older son Camden.

She said: "[There are] more aches and pains. With the first one you can sleep all day, but now I'm running after Camden." 

Cavallari is currently co-presenting The Fabulist on the E! channel.