Lindsay Lohan and GF Samantha Ronson were all smiles at Sam's sister Charlotte's fashion show in Tokyo today -- even though the net is buzzing with reports that LiLo took a liking to "Gossip Girl" star Chace Crawford!

According to In Touch Weekly, Lindsay flirted heavily with Crawford at a New York club during the Diesel XXX party -- then headed back to the bachelor pad that the 23-year-old actor shares with his Upper East Side co-star, Ed Westwick.

LiLo's gal pal needn't fret though -- she reportedly accompanied the "Mean Girls" actress to Chace's Big Apple flat.