She is yet to confirm reports that she has given birth to a little girl called Lavinia. But unconcerned about making an official announcement, Petra Ecclestone decided to take a break from her new role and treat herself to a leisurely lunch. The heiress, who has instantly snapped back to her former shape, was joined by her newly engaged sister Tamara and her fiancé Jay Rutlland in Los Angeles. Looking good: Petra Ecclestone, who is believed to have had a daughter, stepped out for lunch in LA on Thursday The 24-year-old mother showed off her figure in a tight grey dress, which she wore with a pair of denim platform trainers. She accessorised her look with a pink patterned scarf and a grey handbag, while her long blonde hair was worn loose and she covered her eyes with sunglasses. While Petra certainly looked bronzed, her tan just didn’t compare to her old sister’s Tamara, who has recently been sporting a rather extreme colour. Sister time: Petra was joined