Paris Hilton -- Ecstatic That Kim Kardashian Got Knocked Up

Kim Kardashian's former BFF Paris Hilton is putting their old feud even further behind them, and toasting Kim's big baby news ... TMZ has learned.

Our sources in Miami -- where Paris is getting ready to celebrate NYE -- tell us P was shopping when a friend walked up and broke the news about Kim and Kanye West having a baby.

We're told Paris simply smiled and said, "So happy for her, they are perfect for each other."

Paris and Kim were on the outs for years until a few months ago when they reunited and danced up a storm at a friend's party -- and then met up again at a recent event in Miami.

We're told Paris is ringing in 2013 with a high-dollar double date -- her and model bf River Viiperi ... along with sister Nicky Hilton and her billionaire bf James Rothschild.