Kate Moss has fuelled rumors after she was seen looking at engagement rings with lover Pete Doherty.The supermodel and the former drug addict were browsing over sparkling bands during a romantic trip to Florence at the weekend. One onlooker said: "They both looked like a pair of loved-up teenagers but they were taking the matter of rings very seriously. There is no guarantee it's an engagement ring but it seems significant to them."Kate, 32, made her best efforts to hide the sparkler when she arrived in Heathrow airport yesterday, by covering it up with her sleeve. Meanwhile, Pete's uncle Phil Michels has claimed the 32-year-old catwalk queen is pregnant with his nephew's baby. He told Britain's Sunday Mirror newspaper: "I have spoken to Pete twice about the baby and he has confirmed that Kate is pregnant. They are both delighted and Pete sounded really excited. Pete told me they want a baby to cement their marriage."Meanwhile Kate has reportedly given Pete a list of six rules which he must obey or she will call off their alleged wedding. The 32-year-old supermodel is calling the rules 'Kate's Commandments' and insists the junkie rocker must stop taking drugs, end contact with his 'loser' friends and call her at least thee times a day. Pete, 27, must also stop flirting with his groupies if he wants to make Kate his bride, start eating properly and spend two hours every day writing poetry and music. A source said: "Pete is prone to going AWOL. Kate has warned Pete that if he doesn't comply, their relationship is off."Kate and Pete are apparently planning to marry in Ibiza on her 33rd birthday in January next year. She agreed to marry the rocker after he checked into The Priory rehab centre to battle his addictions to crack cocaine and heroin. Since leaving rehab Pete has managed to stay clean.