The Transformers actor dropped out of Broadway play Orphans in February and he subsequently went public with email correspondence between the 30 Rock star, director Daniel Sullivan and playwright Lyle Kessler in a bid to explain his sudden decision to leave the production.
The move appeared to infuriate Baldwin, who seemingly suggested LaBeouf is not cut out for theatre work during a recent interview.
However, LaBeouf, who was replaced by 3:10 to Yuma actor Ben Foster in the show, appeared to prove the feud is over by attending the first preview of the play at Manhattan's Schoenfeld Theatre.
The actor sat in the first row for last Tuesday's performance and was seen giving the cast a standing ovation at the end of the play.
Orphans will officially open on 18 April.