Chris Brown and Rihanna are finding it difficult to get any time alone together because of their busy schedules.The couple - who reconciled last year even though Chris is still on probation for beating Rihanna up in 2009 - were spotted partying at different Los Angeles hotspots over the weekend but friends insist they are still together and just have a lot going on.A source told HollywoodLife.com: "Chris ain't trying to hear no nonsense today. It's simple, he with Ri."They're cool and if and when something changes between them that's between them - they both have a lot going in their careers right now and just doing them and focused on they work.""They've been trying to connect but it hasn't been clicking for them. It ain't like Rihanna got time to just chill and run through - she's on tour and her schedule is way too tight."Chris recently revealed he revealed loves collaborating with Rihanna and they have a great working relationship because they are so similar.The 23-year-old singer said: "It flows easy. What works with us is that we have similar ways of creating music."It's as effortless as can be."