They invited 50 guests to Il Cielo in Beverly Hills for cocktails and cake to celebrate their upcoming wedding--which we hear is this summer.
The whole place was "was decorated with candles and red roses," a source tells People magazine.
Aww these two are really growing on us. And to think just one year ago Katy was going through a huge breakup with then boyfriend Travis Maccoy from Gym Class Heroes. What a difference a year makes!