Britney Spears, 38, wears an off-the-shoulder blouse as she rides horses with her 'prince' Sam Asgha

Britney Spears shared a sweet post to her Instagram account on Sunday.The Oops... I Did It Again crooner looked very comfortable on top of her horse as she went for a ride with her longtime boyfriend, model and personal trainer Sam Asghari.'Prince @samasghari & The Southern Star ⭐️❣️,' the 38-year-old siren also shared in her comment box. The diva wore an off-the-shoulder country print blouse along with beige shorts and mid-calf boots as she held the reins of a perfectly groom horse.Sam wore a white Polo shirt with the number three on his sleeve, white shorts, sneakers and a white cowboy hat. The two appeared to be near Calabasas where Kobe Bryant's helicopter went down on Sunday morning. Calabasas and neighboring Hidden Hills - where the Kardashian and Jenner families live - offer many horse trails.Or they could have been closer to nearby Thousand Oaks, where the pop star owns a sprawling mansion.  Last week Spears gave her 23.3 million Instagram followers a treat when she showed off her favorite fitness routine.The star posted a time-lapse video of herself practicing yoga on the lawn.The clip showcased her youthful figure in a vibrant green bikini as she worked up a sweat. Britney started her lightning-quick video with what looked like simple stretches to make sure she didn't strain any of her muscles.She began her routine with the common Downward Dog pose, before breaking into what looked like the Monkey pose. The 5ft4in Toxic singer showcased her flexibility when she pulled her leg up in the air as part of the Lord of the Dance pose.'Another day at yoga .... consistency is key. With me it’s sort of like prayer. Such a beautiful day .... god speed and god bless,' she captioned the photo, followed by a bevy of emojis. Britney arched her back in what looked like the Warrior I pose, and she also showed off her flexible legs in a side angle position.The Me Against The Music singer let her long blonde locks hang down her back in wavy tendrils, and she completed her minimalist look with a pair of brilliant white trainers.She didn't specify where she was, though she appeared to be getting in some exercise in the back yard of her stunning mansion in Thousand Oaks, California. Britney previously went through her yoga routine last week in a patterned purple bikini.'In 2020 I will be doing a lot more acro yoga and the basics for yoga …. I'm a beginner and it's kind of hard to let go …. learning to trust and letting someone else hold your body!!!,' she wrote at the time.On Thursday, she showcased her taut tummy and athletic figure with a photo of her in a skimpy snakeskin-patterned bikini that was taken from her balcony. Absent from her public workout was her boyfriend Asghari, 26, whom she's been dating for the last three years.The singer–songwriter also has two children from her marriage to Kevin Federline: Sean, 14, and Jayden, 13.She got engaged to the rapper and DJ in July 2004, three months after they had first met.The two were married in O