United Kingdom, Dec. 14 -- Lindsay Lohan has hailed her role in The Simpsons a "dream come true".

The Mean Girls actress has lent her voice to an older version of the family's youngest member, Maggie Simpson, in an episode titled Parahormonal Activity which will air on Sunday (14.12.25) and she was honoured to be involved with the long-running animated sitcom.

Lindsay shared a still from the flash-forward episode and wrote: "Catch me on #TheSimpsons this Sunday on Fox! What a dream come true to be part of this iconic family.(sic)"

The 39-year-old star also shared a preview clip from the upcoming episode.

She wrote: "Here's a preview clip of my episode of #thesimpsons which airs Sunday, December 14th at 8:00pm ET/7:00pm CT on @foxtv (s...