Jessica Simpson has tried to marry her fiance Eric Johnson twice, but her unexpected pregnancies forced the couple to call off the wedding dates.

Simpson became engaged to the retired football star in 2010 and has been planning her wedding ever since, but she had to delay the ceremony after conceiving her daughter Maxwell in 2011 and again after falling pregnant last year.

The mother-to-be tells talk show host Jay Leno, “We’ve had two different wedding dates, but he keeps knocking me up. We’re doing (marriage) very backwards, I know… I’ll just keep my legs crossed, I guess, this time.”

When asked if she was planning for a second baby, Simpson adds, “Nope! Apparently it was a part of God’s plan for my life. I was extremely shocked… because I was going through a lot of hormonal changes, trying to get back to the old, vibrant Jessica. You know, it was kind of like a one-night stand. And it happened, all over again!”

Simpson, a spokesperson for diet firm WeightWatchers, is determined to have a healthy second pregnancy because she piled on the pounds by eating “everything in sight” while expecting her first child.

She explains, “I was really happy to be pregnant (with Maxwell) and I didn’t ever step on the scale. I didn’t realize you could gain that much weight that quickly. (I gained) a lot more than doctors would recommend. I didn’t really make any healthy good decisions.” (PAW/WNVLEN/LR)