The 27-year-old passed a medical earlier today and will officially become a Blues player when the loan window opens on Saturday.
The former England Under-21 international has recently found playing opportunities at his in-form Barclays Premier League parent club limited and is now hungry to make an impact in the npower Championship with Blues.
The former Chelsea trainee started his senior career at Bristol City before continuing to prove himself as a goalscorer with Reading and Middlesbrough, as well as enjoying loan spells at Charlton Athletic and Norwich City.
Across the course of his career so far, Lita averages over a goal every three games and bagged a brace on his last appearance at St. Andrew’s during a 3-2 win for Reading in the FA Cup in 2007.
Blues boss Lee Clark told bcfc.com: “I know Leroy very well having worked with him at Norwich during a loan spell in which he scored seven goals in 16 games.
“He’s a proven goalscorer who has power and pace and there’s no doubt that he’ll add quality to my squad.”
Lita’s spell at St. Andrew’s will take him up until the middle of December with Swansea having a 24-hour recall option after his first 28 days at Blues.
The Congolese-born forward will wear first-team squad number 29.