Holly Madison on second pregnancy difficulties

Holly Madison, who is already a mother to 3-year-old daughter Rainbow Aurora, recently opened up about the difficult phrase of her second pregnancy.

"I just get tired super easily. Like, yesterday I was catching up with my friends, and I was just telling stories I was excited about and I'm like dead out of breath at the end of it. I was like, this is embarrassing. I feel like I just ran a marathon," she said in an interview.

The 36-year-old author announced the news of her second pregnancy in January, and also revealed that her daughter Rainbow is very excited to be a big sister.

Madison and her husband Pasquale Rotella have welcomed their first baby girl in March 5, 2013.