Katy Perry gave a shout-out to new mom Rihanna and some words of advice from a fellow mother. While she walked the red carpet at the finale of American Idol, Katy was asked if she had any advice for new mom Ri-Ri. Katy had none. She did go on to congratulate Rihanna on the birth of her baby boy, “I know that this time is so precious and it’s just like a gorgeous, cozy time. It’s a beautiful, magic time. Soak it all in.” If you could give Rihanna motherly advice, what would you tell her?