Pop star NICK LACHEY and his girlfriend have turned a problem neighbour into a new best friend after saving his life. The singer and Vanessa Minnillo jumped into action when an elderly man living in their New York apartment block collapsed as he stepped out of an elevator. Minnillo called the emergency services while her boyfriend grabbed the old guy's keys and dashed to get his angina medicine. The couple then stayed with the man until paramedics arrived and took him to hospital, according to the National Enquirer. Ironically, the man was among those who opposed Lachey and Minnillo's move into the condo, citing worries about the paparazzi who follow the couple everywhere.