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Justin Bieber had something special up his sleeve for his mom, Pattie Mallette, on Mother's Day: a sweet serenade.

While the 19-year-old pop star performed to a sold-out crowd in Johannesburg, South Africa, on Sunday night, he surprised both the audience and his mom by bringing her up on stage and dedicating his popular song "One Less Lonely Girl" to her. (Cue the awwwws.)

Just after the show, the singer took to Twitter to further express his love, writing, "Happy Mother's Day @PattieMellatte. Today U R my #OLLG. Love u." Pattie was, of course, equally touched by her son's thoughtful gestures and tweeted, "So yep … @JustinBieber surprised me for Mother's Day tonight & brought me out for OLLG! #VerySweet!" Very sweet, indeed! Good to see the Biebs hasn't forgotten where he came from.

Check out the vid to see Justin's own documentation of the sweet serenade, and be sure to catch omg! Insider on TV tonight for all the latest in entertainment news.

Savannah Guthrie (Twitter)

Savannah Guthrie is reporting some of her own news: She's engaged!

The "Today"  co-anchor was showing off a new sparkler on the set of the NBC morning show on Monday. The 41-year-old told her colleagues that her political consultant beau Mike Feldman proposed to her over the weekend.

When Al Roker joked that something was blinding him at the news desk this morning, Guthrie flashed her massive round diamond ring which featured smaller diamonds around the band.

Guthrie and Mike Feldman (Getty Images)"Yes, I got engaged!" she exclaimed, noting that she "adores" Feldman, whom she has been dating for four years. "As he said, no one will accuse us of rushing into anything."

Guthrie told viewers that she was trying to get her co-workers to notice her ring when she first arrived at the set on Monday morning -- to no avail. Matt Lauer said he was surprised they missed it, given its size.

"You could have seen it from across the street. It's a beauty," said Lauer, who later posted a photo of Guthrie's new bling on Twitter.

When Roker -- who

Justin Timberlake has conquered music, film, and TV, so could politics be in his future? According to a new survey conducted by Public Policy Polling, respondents overwhelmingly chose Justin Timberlake as the musician they'd like to see in the Oval Office, with 34% of those polled choosing the 32-year-old crooner as a pick for prez! Well, he has proven that he looks pretty good in a suit and tie!

Also high on the list, Adele (who’s British and can’t even be president!) and Beyonce, who were named as potential White House residents by 19% and 14% of those surveyed, respectively. One thing the divided political parties have in common: Their mutual hatred for Justin Bieber! Of all the artists mentioned in the poll of 571 voters, the Biebs was the only singer who is disliked by Democrats (54%), Republicans (56%) and Independents (56%) alike!

But he's not alone! Check out the vid to find out which other musicians had poor marks in the political poll!

In case you haven't heard, Kellan Lutz is back on the market.

The 28-year-old best known as one of those blood-thirsty Cullens from "Twilight" and his girlfriend of nearly two years, Australian actress Sharni Vinson, have reportedly called it quits. (His rep did not immediately respond to a request for comment.)

Lutz strolls with Sharni Vinson. (Grey Wasp/Blue Wasp/Splash News)Twilight star Kellan Lutz bares his beach-worthy bod. (PacificCoastNews.com)

[Related: Kellan Lutz and Sharni Vinson Split]

But at the exact moment his relationship has ended, the actor's career is in overdrive. He'll play the ripped main character in 2014's "Hercules," and provide the voice of Tarzan in an upcoming adaptation of the jungle story. This month, he stars alongside Amber Heard and Brittany Snow in the satirical comedy "Syrup," which is currently available on pay-per-view and hits theaters June 1. "Syrup" is about a guy who has an idea for a new product that he thinks could earn him big bucks, but only if he trusts the villainous Sneaky Pete, who's played by Lutz.

Omg! caught up with the hunk about his "Twilight" co-stars, his latest flick, and -- the biggest question of all -- how he maintains such a buff bod!

Jennifer Aniston rocks 'The Rachel' (NBC)Inspiration comes from all sorts of places -- and in the case of Jennifer Aniston and her iconic "Friends" haircut, it came from Mary Jane.

Chris McMillan, the wizard behind Aniston's coveted locks, admitted to being stoned in 1994 when he conceived the layered look that caused a sensation, better known as 'The Rachel.:

"I’m 14 years sober, so I feel safe enough to say that," McMillan laughed to Women's Wear Daily. He didn't say if Jen, um, collaborated with him at the time.

What they've definitely partnered up on is Living Proof, a hair care line that Aniston has a stake in. Life certainly hasn't been one perfect hair moment after the next for the future Mrs. Justin Theroux.

"I'd only had mullets!" Aniston, 44, told our sister blog Shine of her pre-"Rachel" days.

Elisabeth Hasselbeck (INSIDER IMAGES/Gary He)Elisabeth Hasselbeck has launched The Active Family Project, a campaign designed to help moms take back family playtime and start living a healthier and more active lifestyle.

"The Active Family Project is a great initiative," Hasselbeck told omg! about her new venture. "It's a phenomenal resource to parents to just get families together. There is even an activity finder you can check out online. Being active has its benefits and being together as a family has its benefits, and when you combine the two, it's win win."

Ouch! Kanye hits a street sign (Clint Brewer/SplashNews)But Kanye managed to keep his cool! (Clint Brewer/SplashNews)D'oh!

We've all done it at some point, and now Kanye West is smartin' after being caught hitting his head on a metal sign post in Beverly Hills while walking with pregnant girlfriend Kim Kardashian.

Miley Cyrus is back.

The 20-year-old singer-actress lost handily to model Rosie Huntington-Whiteley the last time she stepped into the ring for a Fashion Faceoff. Let's see if she can do any better in the same outfit against precocious 12-year-old singer Willow Smith.

Willow Smith (WireImage)Miley Cyrus (WireImage)