Jennifer Lopez fans who started gathering on Hollywood Boulevard for the actress/singer's Walk of Fame star ceremony early on Thursday (21Jun13) will be rewarded with keepsake pins. City officials will hand out the special mementos to the first 250 fans in line for the salute to the star at lunchtime on Thursday. The On the Floor singer is very excited about the honour - thanking fans for their congratulations as she arrived in Hollywood for the ceremony, she tweeted, "I wouldn't be where I am today w/o (without) all of YOU and your infinite love & dedication. So excited for all of you to share this day with me!!!" Lopez will unveil the 2,500th star on the Walk of Fame. The ceremony is just what Walk of Fame officials need after a woman was stabbed to death on the famous sidewalk just after sunset on Tuesday (18Jun13). Reports suggest Christine Darlene Calderon was killed when she refused to hand over a dollar for taking a photo of a man displaying a sign asking for money. The 23 year old died of her injuries at Cedars-Sinai Medical Center.