Liza Morales Thought Khloe & Lamar Wedding "Was A Joke!"

Lamar Odom's baby-mama and ex-fiancée Liza Morales was as surprised as anyone else when she heard about Khloe Kardashian and Odom's upcoming quickie wedding on Sunday.

"I didn't believe it because I got it in a text message, so I thought it was a joke," Morales admits. "I knew they were dating, because, like everybody else saw, they were going all of these places they could be seen. So that's how I found out they were dating."

"It's just really, really shocking," she tells E! News. "Everybody, and I quote, 'everybody' is shocked by this."

Odom, 29, began dating Liza Morales when they were both just 17, and they've had three children together: Destiny, 11, Lamar Jr., 7, and Jayden, who died of SIDS at age 7 month in 2006. The high school sweethearts split two years ago.

Morales who now lives in New York City with the two children, say they don't have an official custody arrangement.

"Lamar has to focus on his children, his relationship with them before he can think about bringing Khloé around," she added.

Meanwhile, bride-to-be Khloe Kardashian has finally confirmed that she and her NBA star beau are tying the knot this Sunday following a whirlwind courtship.