The hotel heiress has put her feud with her reality TV rival behind her and expressed her well wishes for Kim, who is expecting her first child with rapper Kanye West, her boyfriend of eight months.
An onlooker told TMZ they overheard Paris say, "So happy for her, they are perfect for each other", when a friend broke the news to her while out shopping.
Paris, 31, and Kim, 32, had a rivalry for years due to their very similar career paths and lifestyles, but recently made up and were spotted out together at a friend's party and at an event in Miami.
Meanwhile, Kim's brother Rob - who recently split from Rita Ora - has also voiced his delight at the news, which broke when Kanye called Kim his "baby mamma" live on stage in Atlantic City on Sunday (30.12.12).
Rob enthused: "It's beautiful. It's a blessing. The New Year, we've got another child coming, so that's great. Kim's never had a baby, so it's going to be a beautiful blessing."
He also hinted Kim - who is still legally married to estranged husband Kris Humphries - won't be walking down the aisle with Kanye anytime soon and wants to concentrate on motherhood for the time being.
He said: "No idea, no idea. I'm sure that will come down the road, but right now I'm sure everyone's focusing on just the baby going on right now. I'm sure that's something in the future."