Maybe it really is heat exhaustion and dehydration this time.

It has been super hot in Cali.

Lindsay Lohan overcome by heat

'LOS ANGELES (AP) - Actress Lindsay Lohan was overcome by the heat on a movie set and required hospital treatment, her publicist told "The Insider" Wednesday.

The 20-year-old actress was taken by private car Tuesday to a Los Angeles area hospital where she spent several hours being treated for overheating and dehydration, spokeswoman Leslie Sloan Zelnick told the syndicated entertainment show.'

Update: Maybe not.

Paparazzi photogs have come out with a timeline of Lohan's night:

'11:30 pm - party at Guy's with Harry Morton

1:45 am - slam head against car while leaving club

2:30 am - arrive on the set of "Georgia Rules" for night shoots in downtown LA

4:00 am - collapse from heat exhaustion

4:30 am - go to the hospital to find out real reason for collapse

6:00 am - released from hospital; head to Harry's Malibu pad to recover

8:00 pm - dinner at Il Sole with Harry

9:30 pm - head to Chateau Marmont'

Update: In response to her flack saying she got a B12 shot for dehydration:

'Having worked in a hospital pharmacy for 12 years, I know that Vitamin B (Thiamine, typically 100mg injected intramuscularly) shots are NOT given for 'dehydration', or 'heat exhaustion', but rather for alcohol detox, and to help avoid the sometimes dangerous symptoms and/or seizure activity associated with "DT's".'

Defamer