Kristin Cavallari and Jay Cutler are giving it another go!

The reality cutie just tweeted the happy news -- saying, "This time it's official..Jay and I are engaged again."

The couple was rumored to be back on after Jay was spotted in the audience supporting Kristin during her stint on "Dancing with the Stars" -- but this is the first confirmation of the renewed engagement.

Kristin and Jay initially called off their wedding back in July. They were originally set to wed in Spring 2012.

Congrats ... again ... to the happy couple!