Lindsay Lohan has fuelled rumors her relationship with fitness trainer Josh Chunn is growing serious after he joined her on a trip to London.

The "Mean Girls" star jetted into the British capital over the weekend to ring in the New Year, and brought along personal trainer/model Chunn, who she was romantically linked to in November.

The pair enjoyed a night out at Nozomi restaurant on Wednesday night, and tried to cover their faces as they left in a chauffeured car together.

Lohan spent New Year's Eve at a lavish bash thrown by Brunei prince Haji Abdul Azim at The Dorchester hotel, and was paid a reported $100,000 to attend, according to the New York Daily News.