The lifestyle guru and former reality TV star welcomed her first child on Wednesday afternoon, People reported.
Lauren announced that she was pregnant in January, and Liam is one of a few Hills babies.
In an exclusive statement to Us Weekly, the couple wrote, "What a ideal way to start our lives together; surrounded by the people we love most".
Lauren, who famously quit The Hills in in 2010, got married to her soulmate William in 2014.
"He's here", Conrad wrote on an Instagram, posting a photo featuring a needlepoint drawing of her family.
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"Chloe and Fitz aren't so sure..." she then joked of how her 2 dogs reacted to the arrival of the newest family member.
She also took to Instagram when she shared how spoiled she was during the baby shower. "So lucky to have these wonderful ladies in my life!"
Congrats to the happy couple!
Earlier this year, the fashion designer also shared an adorable pic of her growing baby bump while enjoying some fun in the sun. Being a new mom, Conrad knew the fact that it is going to be more of her sleepless nights, but she revealed that they are both excited to experience parenting.