Amanda Bynes has declared she is Britney Spears as she continues her Twitter comeback.

Amanda Bynes
(PA)

The 28-year-old actress, who was placed under psychiatric hold in October, has returned to the microblogging website after a 26-day silence.

She also revealed she has been thinking of getting her studies back on track, and is considering a move to the University of Southern California, based in Los Angeles, after she was reportedly expelled from the Fashion Institute of Design and Merchandising (FIDM).

Amanda marked her return with a photo of herself in a crop top and knee-length skirt on December 6.

2014 has been another tough year for the troubled star, who was diagnosed as bi-polar and a manic depressive.

Amanda makes a court appearance in New York in July
Amanda makes a court appearance in New York in July (AP Photo/Bethan McKernan)

Amanda was arrested on suspicion of driving under the influence of a drug in September. She was later rushed to hospital in October, before being placed on temporary psychiatric hold after accusing her father of sexual abuse. She left the psychiatric facility on October 30, and immediately hit out at her parents over her conservatorship.

The Easy A actress shares several similarities to Britney. They were both child stars, before going through high-profile breakdowns. They have also had dealings with manager Sam Lutfi.