John Mayer is a Twin-Making Daddy in Training

Here's John Mayer dining out at Katsuya in Hollywood last night, during a baby-book reading break. 

The crooning singer huffed and puffed and secretly loved the paparazzi attention as he made his way home and got back to the task at hand: baby-making.

The latest Maniston rumor has it that the couple is talking marriage - and kids.  A source tells Star Magazine of Jen Aniston's Angelina-like determination to fertilize her eggs:

• 'Jen knows her baby-making years are limited. It's hard for her to think of anything else -- she has babies on the brain!
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• Jen has also changed her diet. She's taking a lot of folic acid and has upped her intake of milk and beef -- all of which are supposed to increase your chances of having twins. She's even eating cassava root, a wild yam, because women in Africa who consume it have the highest rate of conceived twins.'

Um, ok crazy.

Meanwhile, John is actually trying to overcome his gargantuous fear of commitment to get on baby board:

'He ordered a bunch of books on Amazon about pregnancy and parenting.  He's just as eager as Jen is. They've discussed how they plan to raise their kids, and they agree on mostly everything. They can't wait to be parents together.

Chances are, Jen's publicist will  announce that the whole story is cacapoopoo again, but in the meantime, can we just ooh and awe over what a cliche Jen is?   She gives Madonna and Denise Richards a run for their money...

Enjoy 7 photos of John leaving Katsuya solo...