Sienna Miller's model mate

Miller met Argentinean Malleville when they both appeared in a Burberry ad campaign several years ago, but they only just started seeing one another romantically. The sparks have been flying for about three weeks, reports the London Mirror, but things are getting serious. The couple have already enjoyed a vacation together.

The pair enjoyed several days together at Malleville’s Coqui Coqui Spa on Talum beach on Mexico’s Mayan Riviera. A source told the Mirror, "The spa was the perfect retreat for them. It's like your own personal tropical hideaway, so it was ideal for Sienna and Nico to get to know each other better. All the activities and sight-seeing really brought Sienna and Nico closer. They discovered that they had so many things in common."