Britney celebrated in a relatively simple way – by ice skating with her boyfriend in Houston. Of course, nothing is ever totally simple for a celeb right of passage. Meanwhile, her famous friends were sending her well-wishes and homemade videos. Kim Kardashian sent her wish via a video on Celebuzz: ”Happy birthday to the beautiful Miss Britney Spears! Welcome to the 30′s club, Brit!!”

Lady Gaga, Justin Beieber, Rihanna, Katy Perry, Ke$ha, Heidi Klum, Miley Cyrus, Ryan Seacrest and many other sent their fond regards, which Britney no doubt enjoyed reading while hanging out  with her sons Preston, 6, and Jayden, 5.

Britney goes back to South America Saturday for her tour, playing a free show in Mexico City this weekend.

Rumer Willis and Kelly Osborne were among those in attendance at the party – so make what you will of the diversity of Miley’s choice in friends. Osborne has since taken to Twitter to defend her friend, but the source who leaked the footage said it’s common knowledge in Miley’s circle that she is, in fact a stoner.  Given that it’s an anonymous source, we’ll take that with a grain of salt. Still, there’s definitely something fishy – or should we say, hazy – going on here.

Yes, the man who nearly split her parents up.  The record will be released later this year.  It’s a cover of “Every Rose Has Its Thorn,” which wasn’t all that great the first time around, but with Miley having the Midas touch recently, it just might be a gigantic hit for her and Bret Michaels.

I guess no one has told her that eventually the money runs out unless she manages to make some more – royalties will only take her so far, and it remains to be seen how marketable she will remain as she gets older and loses her childhood cuteness.

Investigators with the FBI have been looking into the case, and apparently they claim to know who is heading up the hacking efforts, but they have not made any arrests yet.  No word on why – perhaps they’re waiting to catch the perpetrator in the act?  In any case, there may be more nude photos of female celebs in our future if this is left to continue for much longer.

According to older sister Brandi Cyrus’ Twitter, Noah and Miley broke into a jubilant rendition of Miley’s hit single “Can’t Be Tamed,” much to the amusement and delight of the rest of the family.  Apparently the girls spent Christmas Day was spent with their mom, Tish, but dad Billy Ray is also in town so that he can spend some time with the children, as well.

Salvia dealers across the state of California (where Miley was when she smoked the salvia) have reported huge increases in people coming in and asking for “what Miley had,” but at the same time politicians who have tried to get the plant banned in California have said the video (which shows Miley giggling and talking nonsense) is a good example of why salvia should be classed in the same category as dangerous drugs like LSD.  Because, you know, anything that allows people to have that much harmless fun should definitely be against the law.

Taylor’s comment was apparently in response to some photos circulating around the internet, showing Miley doing some pretty over-21 things with an unnamed man at one of her many birthday parties.  Taylor may have just been dishing out some friendly advice on how Miley could salvage her already tarnished reputation, but you have to admit, it did come across as kind of bitchy.

She mentioned that she loves scuba diving and beaches, so maybe some tropical locale is on the cards… but it will be interesting to see whether mom Tish comes along for family time, or whether she’ll stay behind with her boy toy Bret Michaels.  I can’t see them all having a happy time together – I suppose it’s not out of the question for Miley to have separate birthday time with each of her parents.

Both Cyrus and Michaels have officially denied the affair, but we’ve certainly seen more vehement false denials in the past (“I did not have sex with that woman!”).  At least an affair would make sense, as the Cyrus’ marriage seemed to be a happy one until very recently (presumably when Billy Ray found out what was going on).  Friends and sources have said that Billy Ray was completely in the dark about the whole thing, and now he’s seeking custody of all three of the Cyrus children.