Amanda Bynes Plastic Surgery

Amanda Bynes was unceremoniously ejected from a Ritz-Carlton in NYC Thursday after allegedly smoking weed in her hotel room and being so rude to hotel staff ... she made one poor girl cry ...sources tell TMZ.

Amanda begs to differ, telling us she left the hotel voluntarily -- and does NOT smoke weed.

Our sources say Amanda was a nightmare from the get-go, smoking weed everyday despite warnings from hotel staff. We're told Amanda tried using spray chemicals to mask the weed smell.

But that's not it ... we're told Amanda was unspeakably rude to the hotel staff, telling the front desk girl she was "too ugly" to check her in. We're told Amanda then offered her plastic surgeon's services to the desk girl in question ... and the tears started flowing.

The bad behavior continued until Thursday .... Amanda was scheduled to check out at noon, but the hotel staff had had enough ... and kicked her out several hours before mandatory check out.

In case you're wondering where Amanda's going next -- we're told she was last seen getting into a cab headed to LaGuardia Airport ... bound for L.A..

Amanda Bynes followed through on her promise to get her nose fixed after seeing it in her mug shot ... and she tells TMZ she already wants to get another procedure ... ASAP.

In one of her post-arrest Twitter rants, Bynes said she was planning on "getting in shape and getting a nose job!"

Bynes -- who previously copped to having a nose job weeks before her arrest -- tells TMZ she got the procedure done yesterday in Manhattan and explains, "I have no bandage on. It's healing on it's own like my doctor asked."

But she's not stopping there, telling us, "I'm getting one more in 3 weeks, they are short amazing surgeries done while I'm awake but under general anesthesia. It's almost perfect."

She says once her nose "doesn't look so awful in photos" she will stop hiding from the paps.