It's Rachael's first time not making dinner on the show, but it's for an excellent cause. Kristin Davis and Mario Batali give her a break in the kitchen to make Spaghetti and Meatballs, a recipe from The Celebrity Pasta Lovers' Cookbook, which features meals inspired by 10 celebrities' favorite pasta dishes. Kristin's spaghetti recipe was based on the way her mother used to make it, with a little sprucing up from Mario.

The cookbook will be available online free of charge during the month of February, and for each person who downloads a copy, Barilla will donate $1 to America's Second Harvest. The money will be distributed to a network of more than 200 member food banks and food-rescue organizations serving all 50 states, DC and Puerto Rico. Please be advised that this promotion has ended.

Mario's Pasta Cooking Tip:

"You always cook it one minute less than the package instructions suggest, because then you take it out, you drain it, you throw it in the pan with the sauce and the two things -- the sauce and the noodles -- come together as one."