Paris Hilton warned fans not to drink and drive on American Independence Day The hotel heiress - who left prison last week after serving a 23-day jail sentence for driving with a suspended licence - also urged party goers to have a sober driver to take them home after enjoying the annual celebrations. Paris wrote on her MySpace page yesterday: "Happy 4th of July everyone, and remember to be responsible and have a designated driver."Just looking out for you all. I love you and have an amazing summer!"The 26-year-old blond, who has just returned to Los Angeles after holidaying in Hawaii, thanked fans for their support during her time behind bars. Paris said: "I just want to thank you all for your letters of love and support. I am doing my best to respond to each and every one with the letter I wrote - that message was for fans like you who have supported me through it all!"'The Simple Life' star also repeated her intention to turn over a new leaf and do more charity work. Paris revealed: "The past month has inspired me to move forward with some exciting new projects, so I will keep you all posted." Meanwhile, the star enjoyed her first post-prison shopping spree in Los Angeles on Tuesday. Paris - wearing linen shorts, a white silk top, big straw hat and white sunglasses - is said to have spent "a lot", and her purchases included Hello Kitty T-shirts, jewellery, candles, a pink leopard kaftan, a tunic, and a princess-themed toilet roll dispenser.Alexandra Britta, co-owner of the Enchantress and Fifi 'n' Bootsie boutiques, said: "She was so nice and peaceful. She's awesome - it was really great to see her again."