Naomi Watts and LIEV SHREIBER have reportedly become the latest celebrity couple heading for the wedding chapel after the KING KONG star accepted her actor beau's marriage proposal. The couple has been spotted shopping for engagement rings in Los Angeles. An insider at top store Antiquarius tells America's In Touch magazine the couple were shopping for $400,000 (GBP228,600) rings earlier this month (APR06). Meanwhile, another source tells tabloid the Star the couple bought an engagement ring from celebrity jeweller Neil Lane. According to the insider the pair purchased an elegant cushion-cut, 5-carat diamond sparkler worth $150,000 (GBP86,000). Media reports had the couple planning to elope earlier this year (06), after Schreiber proposed to Watts in December (05). This will be both stars' first marriage. Watts' publicist was unavailable for comment when WENN went to press.