Seriously, how can you fall in love so fast?!

Miley Cyrus and Aussie singer/swimmer Cody Simpson have gone from zero to one hundred in about one second flat! The pair hooked up after Miley dumped hubby Liam Hemsworth at the end of the summer and then hooked up with gal pal Kaitlynn Carter and proceeded to dump her a month later. Miley doesn't waste time, folks!

Miley and Cody were outed as a couple last week when a fan spotted them grabbing an acai bowl breakfast and making out. The video went viral and Miley -- since she's so addicted to social media -- HAD to respond with her below post asking why she couldn't just make out with her new boyfriend in peace.

The two have gone on to worship each other on their respective social media accounts -- Cody even calling breakfast Miley made for him, "courtesy of baby." Baby?! After two weeks?!

Meanwhile, a new report claims Liam "doesn't care" that Miley's dating fellow Aussie Cody and that he's "not focused" on his soon-to-be-ex-wife.

Are these two moving too fast? Is Miley headed for another crash-and-burn breakup?