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Justin Bieber is on an absolute tear in Ibiza, and his latest conquest might be his best -- the Playboy Playmate he held a late night make out session with on a yacht.

Biebs was photographed hooking up with Miss July 2013, Alyssa Arce on Thursday night. Our sources say she and Justin met on Wednesday ... and ended up hanging on the same yacht. Funny how that happens in Ibiza.

22-year-old Alyssa is signed with Wilhelmina LA, and we're told she hit it off with Justin almost immediately -- but it's nothing serious just yet.

As one source put it ... they're just "having fun."

Amen.

Lacey Wildd -- the reality TV star who recently underwent her 36th plastic surgery -- squeezed herself into a pink bikini Friday on a beach in Florida.

Wildd is a 46-year-old mother of six (let that sink in) and has had 12 boob jobs alone ... going from an A-cup to the ridiculous LLL-cups she flaunted today.

She's been on TLC's "My Strange Addiction" and is set to appear on the new E! series "Botched."

As far as those shows are concerned, Wildd's a natural.

Beyonce and Jay Z got super snuggly during their Wednesday night concert in Seattle ... clearly an overt display to counter numerous reports of an imminent split.

While her ex and her alleged fling duke it out in Ibiza, Selena Gomez rocked the shortest of shorts Thursday while heading to a meeting in L.A.

As TMZ first reported, while Justin Bieber and Orlando Bloom fought over Miranda Kerr ... there is some tangential Selena involvement.

Our sources say Gomez -- who was once famously photographed with Bloom -- claims she never hooked up with the "Lord of the Rings" star.

Selena Gomez ... hate to see you go, but love to watch you leave.

The tangled and convoluted apparent romance between Orlando Bloom and Erica Packer continued Thursday as the pair hung out at a restaurant in Formentera, Spain.

As TMZ previously reported, Bloom and Packer have been spending lots of time together this week, which wouldn't be weird ... except for the fact that late last year their exes, Miranda Kerr and James Packer, were reportedly romantically linked.

And all 4 of them were friends when the marriages were in tact.

Justin Bieber clearly has a thing for Australian women ... a day after brawling with Orlando Bloom over Miranda Kerr, Biebs was spotted on a yacht in Ibiza with another Aussie babe, Shanina Shaik.

Shaik -- who Instagrammed a few shots from the boat -- was born and raised in Melbourne and has done modeling work for the likes of Vivienne Westwood and Chanel. She dated Tyson Beckford for years until their breakup in 2013.

There's no evidence Justin was involved with their split, so he should be safe ... which is good. Tyson is waaaaaaaay bigger than Orlando.

Whether it be from the side or from the front, who doesn't love boobies?

Lindsay Lohan served up her side-boobage while on the beach in Ibiza -- while Chrissy Teigen and Lady Gaga opted for a cleavage-bearing tops while out and about (separately) in New York City.

Gravity ... it's undefeated.

Gisele Bundchen frolicked around on the beach Tuesday in Costa Rica ... crawling around in the ocean with her adorable dog Lua.

In search of someone who could help protect him should Orlando Bloom strike again, Justin Bieber hung out Wednesday on a yacht in Ibiza with none other than Michelle Rodriguez.

There's nothing romantic going on here -- at least not in these photos -- and besides ... MRod's been hanging with a completely different skinny and often shirtless guy in Zac Efron.

If it came down to it, we feel pretty confident Rodriguez could take Bloom ... and Bieber ... and even Efron in a fight.

Chris Brown continues to look noticeably heavier since getting out of jail ... bravely partying without a shirt on while hanging out Wednesday afternoon in glorious St. Tropez.

CB is partying in France while one of his new neighbors in the San Fernando Valley tells TMZ he has no qualms about shooting the R&B singer if he trespasses onto his property.

Based on these photos, it doesn't seem Chris moves with a lot quickness these days ... so he's best to heed the warning.

Justin Bieber made it clear immediately after he ducked an Orlando Bloom punch -- he was not shaken or rattled.

Justin and a buddy mocked the thwarted punch in the parking lot of Cipriani ... where the altercation went down.

Justin also chatted up some female fans ... knowing of course the photogs were clicking away.

As we reported ... some eyewitnesses claim Justin essentially told Orlando he banged Miranda Kerr... something she has denied.

If Orlando Bloom was worried about Miranda Kerr -- hours before fighting Justin Bieber -- he wasn't showing it because he had his hands full with multiple hot chicks.

Bloom was cruising around the island of Ibiza Tuesday on a speedboat, pumping his fists in the air, dancing with beautiful women ... and looking like he's shouting, "Turn Down for What!" Ultimate bachelor's life.

Looking at these pics, it was VERY GOOD to be Orlando yesterday. Last night? Not so much.

Shoulda stayed on the boat, Orlando.

Kate Walsh went to Disneyland, but it's hooters that ended up making her day -- as she cupped a pair of boobs on Splash Mountain.

The "Private Practice" actress kept her hands well inside the log flume over the weekend -- and showed full support for the knockers seated in front of her during the ride's signature drop.

Kate seemed unimpressed with the rack, but maybe she's just felt 'em before. Turns out the chick is a friend of hers.

Caution: Riders may get wet.

Gerard Butler was up to his old tricks this weekend ... engaging in a full-on makeout session outside of Nobu in Malibu Sunday night.

When he finished facesucking the cute brunette in cut-off shorts -- naturally -- they each went their separate ways and Butler rode off alone on his motorcycle.

Paris Hilton and boyfriend River Viiperi are on the outs, cause she was sucking face with some guy on the beach this weekend ... someone other than River.

Hilton and her new male model friend Josh Upshaw were in Malibu Sunday when they got deep into a make out sesh ... right in the open. According to our sources, Paris and River ended their relationship amicably recently.

Neither has spoken about the break-up, but they haven't been seen together for several months now.

The River no longer runs through it.