Last-minute Ultimate Fighting Championship (UFC) fight fans might be punching themselves in their faces right now for not acting sooner.

The world's leading mixed martial arts (MMA) promotion recently announced that tickets for UFC 145: "Jones vs. Evans" in Atlanta, Ga., this evening (April 21, 2012) are sold out. That means about 18,000 will pack the the Philips Arena to watch UFC Light Heavyweight Champion Jon Jones defend his 205-pound world title against former division kingpin Rashad Evans in the UFC 145 main event.

It's likely the driving force behind the smashing box office success. Here's how the UFC described it in an official press release:

Perhaps no fight in recent memory has had as much buzz as the long-awaited Jones vs Evans title bout, which sees two former friends and training partners collide for the UFC’s 205lbs championship.

The Jon Jones vs. Rashad Evans showdown is the crown jewel of a six-fight pay-per-view (PPV) main card, which also features a co main event clash between Rory MacDonald vs. Che Mills. To check out the latest UFC 145: "Jones vs. Evans" fight card click here.

UFC 145 tickets can still likely be purchased through StubHub.com, which often has seats available even if the event is "sold out". CraigsList.com is also another solid option. However, UFC 145 will also be available to watch on PPV at 10 p.m. ET tonight.

In fact, MMAmania.com will provide LIVE round-by-round, blow-by-blow coverage of the main card action on fight night (Sat., April 21), which is slated to air at 10 p.m. ET on pay-per-view (PPV). The latest quick updates of the live action will begin to flow earlier than that around 7 p.m. ET with the "Prelims" bouts on FX/Facebook.

For all the latest and greatest news and notes for UFC 145: "Jones vs. Evans" click here.