Jay-Z Joins Beyonce's Pregnancy Diet

The Jay-Z/Beyonce Babywatch continues.

Jay-Z is apparently taking his support of pregnant wife Beyonce very seriously. Jay is even joining Bey on her pregnancy diet, with both parents-to-be taking part in a vegan diet.

"Jay's trying to be disciplined, and he needs the energy to support her," a source says.

Beyonce confirmed in an interview with 20/20 that she's very conscious of her diet. "I've been really conscious [about food]," she said. "I've been trying my best not to lose control!"