Her publicist, Pearl Servat, confirmed the news Monday. People magazine was the first to report the pregnancy.
Keibler, 34, posted a photo on her official Twitter account of a bun in an oven saying, "Look what we've got cooking! A Bun'dle of love!"
She and Pobre, a 39-year-old tech entrepreneur, were wed earlier this month in a small ceremony in Mexico. They began dating last fall.
Keibler is a former professional wrestler who now works as a TV personality, actress and model. She dated George Clooney for two years; they broke up last summer.