At what was planned as his 27th birthday party Friday night, LeBron James got down on bended knee and proposed to his long-time girlfriend Savannah Brinson.

The bash for the Miami Heat superstar was hosted by REMY MARTIN V along with his friends Gabrielle Union and Dwayne Wade, and after the engagement they presented James with a tremendous birthday cake with "LJ" on the top.

LeBron and Savannah, who are high school sweethearts, are the parents of two kids who were also at the party.

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An eyewitness tells us LeBron kept stepping away from the table to spend one-on-one time with his sons, and immediately picked them up and swung them around following the proposal.

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Basketball superstar LeBron James' girlfriend, Savannah Brinson, has admitted that Miami is not exactly her favorite place, RadarOnline.com is reporting.

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Brinson tells the September issue of Harper's Bazaar, “Personally, Miami was not my favorite place. Vacationing there is great: You go for three days get some sun, and it’s time to go home.

“It will definitely be an adjustment, but we’ll make it. We’re not complaining. Whatever LeBron felt was comfortable, I’m with him. I just love him so much. We’re soul mates.”

And despite the fact that she is dating one of sports most eligible bachelors, Brinson – who is the mother of his two sons LeBron Jr, 5, and Bryce Maximus, 3 – is in no rush to get married to the superstar forward.

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She added: “I’ve definitely not put a fire under his ass. I would never rush him to do something like that. We’re really comfortable with the way things are now. And it’s not up to me.

“When it happens it happens. We talk about it. If we do it, I want it to be forever.”

And LeBron seems to appreciate her laid-back attitude,  and the fact that their 5-year-old son wants to follow in his father’s footsteps and become an NBA basketball star.

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He told Harper’s Bazaar: “A person like myself needs a great sidekick, and a person you can rely on no matter the circumstances. And she’s that – she’s got my back and I love her for that.

“Well, like any father I would hope that they follow in my footsteps. That would be a great story – and as a father, I would be on cloud nine every day.

“Ultimately, though, only the big man above knows the future. They do have lots of talent though.”