Nick Lachey and Vanessa Minnillo Get Serious  8/31/06

Pop hunk Nick Lachey is getting so serious with his new girlfriend Vanessa Minnillo, the Latina MTV presenter is accompanying him on business trips.

The former 98 Degrees singer, 32, asked Minnillo to join him on a four-day trip to Stockholm, Sweden, to promote his new album What's Left of Me.

A friend tells gossip website PageSix that Lachey and Minnillo are smitten, but are not quite ready to say the 'love' word yet, adding, "They get along really well and he stays with her when he is in town."

Lachey is taking things slowly following his high-profile split from Jessica Simpson. Their divorce was finalized in June (06) - the same month Lachey went public with his relationship with Minnillo after they were photographed holidaying in Cabo San Lucas, Mexico, together.